human
***TASK*** the task is to summarize an input biomedical literature in six sentences 
    ***INPUT*** the input is a biomedical literature 
    ***OUTPUT*** the output is the summary of an input biomedical literature in six sentences 
    ***DOCUMENTATION*** 
    ***EXAMPLES*** 
    Input: UNLABELLED Low back pain ( LBP ) is one of the most common medical problems in our society . Increasingly , patients are turning to nonpharmacologic analgesic therapies such as percutaneous electrical nerve stimulation ( PENS ) . We design ed this sham-controlled study to compare the effect of three different frequencies of electrical stimulation on the analgesic response to PENS therapy .  Sixty-eight consenting patients with LBP secondary to degenerative lumbar disc disease were treated with PENS therapy at 4 Hz , alternating 15 Hz and 30 Hz ( 15/30 Hz ) , and 100 Hz , as well as sham-PENS ( 0 Hz ) , according to a r and omized , cross-over study design . Each treatment was administered for a period of 30 min three times per week for 2 wk . The pre- and posttreatment assessment s included the health status survey short form and visual analog scales for pain , physical activity , and quality of sleep . After receiving all four treatments , patients completed a global assessment question naire . The sham-PENS treatments failed to produce changes in the degree of pain , physical activity , sleep quality , or daily intake of oral analgesic medications . In contrast , 4-Hz , 15/30-Hz , and 100-Hz stimulation all produced significant decreases in the severity of pain , increases in physical activity , improvements in the quality of sleep , and decreases in oral analgesic requirements ( P < 0.01 ) . Of the three frequencies , 15/30 Hz was the most effective in decreasing pain , increasing physical activity , and improving the quality of sleep ( P < 0.05 ) . In the global assessment , 40 % of the patients reported that 15/30 Hz was the most desirable therapy , and it was also more effective in improving the patient 's sense of well-being . We conclude that the frequency of electrical stimulation is an important determinant of the analgesic response to PENS therapy . Alternating stimulation at 15-Hz and 30-Hz frequencies was more effective than either 4 Hz or 100 Hz in improving outcome measures in patients with LBP . IMPLICATION S The frequency of electrical stimulation seems to be an important determinant of the analgesic efficacy of percutaneous electrical nerve stimulation . Mixed low- and high-frequency stimulation was more effective than either low or high frequencies alone in the treatment of patients with low back pain Study Design . A prospect i ve clinic‐based survey . Objectives . To study the type , frequency , and characteristics of unpleasant side effects after spinal manipulative therapy . Summary of Background Data . Spinal manipulative therapy is a commonly used treatment , but there is little knowledge of its side effects . Methods . Information regarding unpleasant reactions after spinal manipulative therapy was collected after 4712 treatments on 1058 new patients by 102 Norwegian chiropractors ( response rate , 70 % ) through structured interviews . Results . At least one reaction was reported by 55 % of the patients some time during the course of a maximum of six treatments . Of the reported reactions , the most common were local discomfort ( 53 % ) , headache ( 12 % ) , tiredness ( 11 % ) , or radiating discomfort ( 10 % ) . Reactions were mild or moderate in 85 % of patients . Sixty‐four percent of reactions appeared within 4 hours of treatment , and 74 % had disappeared within 24 hours . Uncommon reactions were dizziness , nausea , hot skin , or " other " complaints , each accounting for 5 % or less of reactions . It was unusual that symptoms commenced later than on the day of or the day after treatment , were of long duration ( not gone at the latest on the day after onset ) , described as severe , or that they result ed in reduced activities of daily living . There were no reports of serious complications in this study . Conclusions . Profiles now are described of common and uncommon reactions to spinal manipulative therapy and their latency , duration , and severity OBJECTIVE To determine the prevalence and characteristics of fibromyalgia in the general population . METHODS A r and om sample of 3,006 persons in Wichita , KS , were characterized according to the presence of no pain , non-widespread pain , and widespread pain . A sub sample of 391 persons , including 193 with widespread pain , were examined and interviewed in detail . RESULTS The prevalence of fibromyalgia was 2.0 % ( 95 % confidence interval [ 95 % CI ] 1.4 , 2.7 ) for both sexes , 3.4 % ( 95 % CI 2.3 , 4.6 ) for women , and 0.5 % ( 95 % CI 0.0 , 1.0 ) for men . The prevalence of the syndrome increased with age , with highest values attained between 60 and 79 years ( > 7.0 % in women ) . Demographic , psychological , dolorimetry , and symptom factors were associated with fibromyalgia . CONCLUSION Fibromyalgia is common in the population , and occurs often in older persons . Characteristic features of fibromyalgia -- pain threshold and symptoms -- are similar in community and clinic population s , but overall severity , pain , and functional disability are more severe in the clinic population Sciatica is a common pain problem and current pharmacologic therapies have proven inadequate for many patients . The objective of this sham-controlled investigation was to compare a novel non-pharmacologic technique , percutaneous electrical nerve stimulation ( PENS ) , to transcutaneous electrical nerve stimulation ( TENS ) in the management of the radicular pain associated with sciatica . Sixty-four consenting patients with sciatica due to lumbar disc herniation were treated with PENS , TENS and sham-PENS according to a r and omized , single-blinded , cross-over study . All patients had been maintained on a stable oral non-opioid analgesic regimen for at least 6 weeks prior to entering the study . Each treatment modality was administered for a period of 30 min three times per week for 3 weeks , with 1 week ' off ' between each modality . Both PENS and TENS treatments were administered using a stimulation frequency of 4 Hz . The pre-treatment assessment included the health status survey short form ( SF-36 ) , as well as visual analog scales ( VAS ) for radicular pain , physical activity and quality of sleep . The pain VAS was also repeated after each treatment session . At the end of each 3-week treatment block , the SF-36 was repeated . After receiving all three treatment modalities , a global assessment question naire was completed . Both PENS ( 42 % ) and TENS ( 23 % ) were significantly more effective than the sham ( 8 % ) treatments in decreasing VAS pain scores . The daily oral analgesic requirements were also significantly reduced compared to the pre-treatment values with PENS ( P<0.01 ) and TENS ( P<0.05 ) . However , PENS was significantly more effective than TENS ( and sham-PENS ) in improving physical activity and quality of sleep . The SF-36 evaluation confirmed the superiority of PENS ( versus TENS and sham-PENS ) with respect to post-treatment functionality . In the overall assessment , 73 % of the patients reported that PENS was the most desirable modality ( versus 21 % for TENS and 6 % for sham-PENS ) . Finally , 71 % of the patients stated that they would be willing to pay extra to receive PENS therapy compared to 22 % and 3 % for TENS and sham-PENS , respectively . In this sham-controlled study , we concluded that PENS was more effective than TENS when administered at a stimulation frequency of 4 Hz in providing short-term pain relief and improved functionality in patients with sciatica & NA ; This paper presents the results of a detailed study of the pain epidemiology and health related quality of life ( HRQL ) in 150 chronic non‐malignant pain patients consecutively referred to a Danish multidisciplinary pain center . Mean pain severity was 71.6 ( SD=18.5 ) on the VAS scale . Forty‐two percent reported poor quality of sleep . HRQL was evaluated with the Medical Outcome Study ‐Short Form ( SF‐36 ) , the Hospital Anxiety and Depression scale ( HAD ) and the Psychological General Well‐Being Scale ( PGWB ) . Compared with the normal population ( NP ) both SF‐36 scores and PGWB scores were significantly reduced ( P<0.001 ) indicating that physical , psychological and social well‐being were severely reduced . On the HAD scale 58 % were found to have a depressive or anxiety disorder . Statistically significant but modest correlations were found between pain severity and HRQL . Psychological and social well‐being was closely correlated . Sixty‐three percent of the referred patients had neurogenic pain conditions . Of these , only 25 % were treated with antidepressants or anticonvulsants at referral . Seventy‐three percent were treated with opioids at referral . Mean opioid consumption was 64 mg of morphine per day ( range 1–280 mg ) . Compared with the NP the chronic pain patients had used the health care system five times more often in the years prior to referral ( P<0.001 ) . The study confirms the severe multidimensional impact of chronic pain and demonstrates that HRQL of chronic non‐malignant pain patients is among the lowest observed for any medical condition Renal prostagl and in inhibition by nonsteroidal antiinflammatory drugs ( NSAIDs ) may decrease renal function , especially under conditions of low effective circulating volume . To evaluate the risk of important deterioration of renal function due to this effect , the authors performed a nested case-control study using Tennessee Medicaid enrollees aged > or = 65 years in 1987 - 1991 . Cases were patients who had been hospitalized with community-acquired acute renal failure ; they were selected on the basis of medical record review of Medicaid enrollees with selected discharge diagnoses . Information on the timing , duration , and dose of prescription NSAIDs used , demographic factors , and comorbidity was gathered from computerized Medicaid-Medicare data files . Of the 1,799 patients with acute renal failure ( 4.51 hospitalizations per 1,000 person-years ) , 18.1 % were current users of prescription NSAIDs  as compared with 11.3 % of 9,899 r and omly selected population controls . After control for demographic factors and comorbidity , use of NSAIDs increased the risk of acute renal failure 58 % ( adjusted odds ratio = 1.58 ; 95 % confidence interval ( CI ) : 1.34 , 1.86 ) . For ibuprofen , which accounted for 35 % of NSAID use , odds ratios associated with dosages of < or = 1,200 mg/day , > 1,200-<2,400 mg/day , and > or = 2,400 mg/day were 0.94 ( 95 % CI : 0.58 , 1.51 ) , 1.89 ( 95 % CI : 1.34 , 2.67 ) , and 2.32 ( 95 % CI : 1.45 , 3.71 ) , respectively ( test for linear trend : p = 0.009 ) . Prescription NSAID use result ed in an estimated 25 excess hospitalizations associated with renal failure per 10,000 years of use . Thus , NSAIDs represent a relatively uncommon but avoidable cause of acute renal failure in frail elderly persons CONTEXT A prior national survey documented the high prevalence and costs of  alternative medicine use in the United States in 1990 . OBJECTIVE To document trends in alternative medicine use in the United States between 1990 and 1997 . DESIGN Nationally representative r and om household telephone surveys using comparable key questions were conducted in 1991 and 1997 measuring utilization in 1990 and 1997 , respectively . PARTICIPANTS A total of 1539 adults in 1991 and 2055 in 1997 . MAIN OUTCOMES MEASURES Prevalence , estimated costs , and disclosure of alternative therapies to physicians . RESULTS Use of at least 1 of 16 alternative therapies during the previous year increased from 33.8 % in 1990 to 42.1 % in 1997 ( P < or = .001 ) . The therapies increasing the most included herbal medicine , massage , megavitamins , self-help groups , folk remedies , energy healing , and homeopathy . The probability of users visiting an alternative medicine practitioner increased from 36.3 % to 46.3 % ( P = .002 ) . In both surveys alternative therapies were used most frequently for chronic conditions , including back problems , anxiety , depression , and headaches . There was no significant change in disclosure rates between the 2 survey years ; 39.8 % of alternative therapies were disclosed to physicians in 1990 vs 38.5 % in 1997 . The percentage of users paying entirely out-of-pocket for services provided by alternative medicine practitioners did not change significantly between 1990 ( 64.0 % ) and 1997 ( 58.3 % ) ( P=.36 ) . Extrapolations to the US population suggest a 47.3 % increase in total visits to alternative medicine practitioners , from 427 million in 1990 to 629 million in 1997 , thereby exceeding total visits to all US primary care physicians . An estimated 15 million adults in 1997 took prescription medications concurrently with herbal 
    Output:
    
agent
***TASK*** the task is to summarize an input biomedical literature in six sentences 
    ***INPUT*** the input is a biomedical literature 
    ***OUTPUT*** the output is the summary of an input biomedical literature in six sentences 
    ***DOCUMENTATION*** 
    ***EXAMPLES*** 
    Input: UNLABELLED Low back pain ( LBP ) is one of the most common medical problems in our society . Increasingly , patients are turning to nonpharmacologic analgesic therapies such as percutaneous electrical nerve stimulation ( PENS ) . We design ed this sham-controlled study to compare the effect of three different frequencies of electrical stimulation on the analgesic response to PENS therapy .  Sixty-eight consenting patients with LBP secondary to degenerative lumbar disc disease were treated with PENS therapy at 4 Hz , alternating 15 Hz and 30 Hz ( 15/30 Hz ) , and 100 Hz , as well as sham-PENS ( 0 Hz ) , according to a r and omized , cross-over study design . Each treatment was administered for a period of 30 min three times per week for 2 wk . The pre- and posttreatment assessment s included the health status survey short form and visual analog scales for pain , physical activity , and quality of sleep . After receiving all four treatments , patients completed a global assessment question naire . The sham-PENS treatments failed to produce changes in the degree of pain , physical activity , sleep quality , or daily intake of oral analgesic medications . In contrast , 4-Hz , 15/30-Hz , and 100-Hz stimulation all produced significant decreases in the severity of pain , increases in physical activity , improvements in the quality of sleep , and decreases in oral analgesic requirements ( P < 0.01 ) . Of the three frequencies , 15/30 Hz was the most effective in decreasing pain , increasing physical activity , and improving the quality of sleep ( P < 0.05 ) . In the global assessment , 40 % of the patients reported that 15/30 Hz was the most desirable therapy , and it was also more effective in improving the patient 's sense of well-being . We conclude that the frequency of electrical stimulation is an important determinant of the analgesic response to PENS therapy . Alternating stimulation at 15-Hz and 30-Hz frequencies was more effective than either 4 Hz or 100 Hz in improving outcome measures in patients with LBP . IMPLICATION S The frequency of electrical stimulation seems to be an important determinant of the analgesic efficacy of percutaneous electrical nerve stimulation . Mixed low- and high-frequency stimulation was more effective than either low or high frequencies alone in the treatment of patients with low back pain Study Design . A prospect i ve clinic‐based survey . Objectives . To study the type , frequency , and characteristics of unpleasant side effects after spinal manipulative therapy . Summary of Background Data . Spinal manipulative therapy is a commonly used treatment , but there is little knowledge of its side effects . Methods . Information regarding unpleasant reactions after spinal manipulative therapy was collected after 4712 treatments on 1058 new patients by 102 Norwegian chiropractors ( response rate , 70 % ) through structured interviews . Results . At least one reaction was reported by 55 % of the patients some time during the course of a maximum of six treatments . Of the reported reactions , the most common were local discomfort ( 53 % ) , headache ( 12 % ) , tiredness ( 11 % ) , or radiating discomfort ( 10 % ) . Reactions were mild or moderate in 85 % of patients . Sixty‐four percent of reactions appeared within 4 hours of treatment , and 74 % had disappeared within 24 hours . Uncommon reactions were dizziness , nausea , hot skin , or " other " complaints , each accounting for 5 % or less of reactions . It was unusual that symptoms commenced later than on the day of or the day after treatment , were of long duration ( not gone at the latest on the day after onset ) , described as severe , or that they result ed in reduced activities of daily living . There were no reports of serious complications in this study . Conclusions . Profiles now are described of common and uncommon reactions to spinal manipulative therapy and their latency , duration , and severity OBJECTIVE To determine the prevalence and characteristics of fibromyalgia in the general population . METHODS A r and om sample of 3,006 persons in Wichita , KS , were characterized according to the presence of no pain , non-widespread pain , and widespread pain . A sub sample of 391 persons , including 193 with widespread pain , were examined and interviewed in detail . RESULTS The prevalence of fibromyalgia was 2.0 % ( 95 % confidence interval [ 95 % CI ] 1.4 , 2.7 ) for both sexes , 3.4 % ( 95 % CI 2.3 , 4.6 ) for women , and 0.5 % ( 95 % CI 0.0 , 1.0 ) for men . The prevalence of the syndrome increased with age , with highest values attained between 60 and 79 years ( > 7.0 % in women ) . Demographic , psychological , dolorimetry , and symptom factors were associated with fibromyalgia . CONCLUSION Fibromyalgia is common in the population , and occurs often in older persons . Characteristic features of fibromyalgia -- pain threshold and symptoms -- are similar in community and clinic population s , but overall severity , pain , and functional disability are more severe in the clinic population Sciatica is a common pain problem and current pharmacologic therapies have proven inadequate for many patients . The objective of this sham-controlled investigation was to compare a novel non-pharmacologic technique , percutaneous electrical nerve stimulation ( PENS ) , to transcutaneous electrical nerve stimulation ( TENS ) in the management of the radicular pain associated with sciatica . Sixty-four consenting patients with sciatica due to lumbar disc herniation were treated with PENS , TENS and sham-PENS according to a r and omized , single-blinded , cross-over study . All patients had been maintained on a stable oral non-opioid analgesic regimen for at least 6 weeks prior to entering the study . Each treatment modality was administered for a period of 30 min three times per week for 3 weeks , with 1 week ' off ' between each modality . Both PENS and TENS treatments were administered using a stimulation frequency of 4 Hz . The pre-treatment assessment included the health status survey short form ( SF-36 ) , as well as visual analog scales ( VAS ) for radicular pain , physical activity and quality of sleep . The pain VAS was also repeated after each treatment session . At the end of each 3-week treatment block , the SF-36 was repeated . After receiving all three treatment modalities , a global assessment question naire was completed . Both PENS ( 42 % ) and TENS ( 23 % ) were significantly more effective than the sham ( 8 % ) treatments in decreasing VAS pain scores . The daily oral analgesic requirements were also significantly reduced compared to the pre-treatment values with PENS ( P<0.01 ) and TENS ( P<0.05 ) . However , PENS was significantly more effective than TENS ( and sham-PENS ) in improving physical activity and quality of sleep . The SF-36 evaluation confirmed the superiority of PENS ( versus TENS and sham-PENS ) with respect to post-treatment functionality . In the overall assessment , 73 % of the patients reported that PENS was the most desirable modality ( versus 21 % for TENS and 6 % for sham-PENS ) . Finally , 71 % of the patients stated that they would be willing to pay extra to receive PENS therapy compared to 22 % and 3 % for TENS and sham-PENS , respectively . In this sham-controlled study , we concluded that PENS was more effective than TENS when administered at a stimulation frequency of 4 Hz in providing short-term pain relief and improved functionality in patients with sciatica & NA ; This paper presents the results of a detailed study of the pain epidemiology and health related quality of life ( HRQL ) in 150 chronic non‐malignant pain patients consecutively referred to a Danish multidisciplinary pain center . Mean pain severity was 71.6 ( SD=18.5 ) on the VAS scale . Forty‐two percent reported poor quality of sleep . HRQL was evaluated with the Medical Outcome Study ‐Short Form ( SF‐36 ) , the Hospital Anxiety and Depression scale ( HAD ) and the Psychological General Well‐Being Scale ( PGWB ) . Compared with the normal population ( NP ) both SF‐36 scores and PGWB scores were significantly reduced ( P<0.001 ) indicating that physical , psychological and social well‐being were severely reduced . On the HAD scale 58 % were found to have a depressive or anxiety disorder . Statistically significant but modest correlations were found between pain severity and HRQL . Psychological and social well‐being was closely correlated . Sixty‐three percent of the referred patients had neurogenic pain conditions . Of these , only 25 % were treated with antidepressants or anticonvulsants at referral . Seventy‐three percent were treated with opioids at referral . Mean opioid consumption was 64 mg of morphine per day ( range 1–280 mg ) . Compared with the NP the chronic pain patients had used the health care system five times more often in the years prior to referral ( P<0.001 ) . The study confirms the severe multidimensional impact of chronic pain and demonstrates that HRQL of chronic non‐malignant pain patients is among the lowest observed for any medical condition Renal prostagl and in inhibition by nonsteroidal antiinflammatory drugs ( NSAIDs ) may decrease renal function , especially under conditions of low effective circulating volume . To evaluate the risk of important deterioration of renal function due to this effect , the authors performed a nested case-control study using Tennessee Medicaid enrollees aged > or = 65 years in 1987 - 1991 . Cases were patients who had been hospitalized with community-acquired acute renal failure ; they were selected on the basis of medical record review of Medicaid enrollees with selected discharge diagnoses . Information on the timing , duration , and dose of prescription NSAIDs used , demographic factors , and comorbidity was gathered from computerized Medicaid-Medicare data files . Of the 1,799 patients with acute renal failure ( 4.51 hospitalizations per 1,000 person-years ) , 18.1 % were current users of prescription NSAIDs  as compared with 11.3 % of 9,899 r and omly selected population controls . After control for demographic factors and comorbidity , use of NSAIDs increased the risk of acute renal failure 58 % ( adjusted odds ratio = 1.58 ; 95 % confidence interval ( CI ) : 1.34 , 1.86 ) . For ibuprofen , which accounted for 35 % of NSAID use , odds ratios associated with dosages of < or = 1,200 mg/day , > 1,200-<2,400 mg/day , and > or = 2,400 mg/day were 0.94 ( 95 % CI : 0.58 , 1.51 ) , 1.89 ( 95 % CI : 1.34 , 2.67 ) , and 2.32 ( 95 % CI : 1.45 , 3.71 ) , respectively ( test for linear trend : p = 0.009 ) . Prescription NSAID use result ed in an estimated 25 excess hospitalizations associated with renal failure per 10,000 years of use . Thus , NSAIDs represent a relatively uncommon but avoidable cause of acute renal failure in frail elderly persons CONTEXT A prior national survey documented the high prevalence and costs of  alternative medicine use in the United States in 1990 . OBJECTIVE To document trends in alternative medicine use in the United States between 1990 and 1997 . DESIGN Nationally representative r and om household telephone surveys using comparable key questions were conducted in 1991 and 1997 measuring utilization in 1990 and 1997 , respectively . PARTICIPANTS A total of 1539 adults in 1991 and 2055 in 1997 . MAIN OUTCOMES MEASURES Prevalence , estimated costs , and disclosure of alternative therapies to physicians . RESULTS Use of at least 1 of 16 alternative therapies during the previous year increased from 33.8 % in 1990 to 42.1 % in 1997 ( P < or = .001 ) . The therapies increasing the most included herbal medicine , massage , megavitamins , self-help groups , folk remedies , energy healing , and homeopathy . The probability of users visiting an alternative medicine practitioner increased from 36.3 % to 46.3 % ( P = .002 ) . In both surveys alternative therapies were used most frequently for chronic conditions , including back problems , anxiety , depression , and headaches . There was no significant change in disclosure rates between the 2 survey years ; 39.8 % of alternative therapies were disclosed to physicians in 1990 vs 38.5 % in 1997 . The percentage of users paying entirely out-of-pocket for services provided by alternative medicine practitioners did not change significantly between 1990 ( 64.0 % ) and 1997 ( 58.3 % ) ( P=.36 ) . Extrapolations to the US population suggest a 47.3 % increase in total visits to alternative medicine practitioners , from 427 million in 1990 to 629 million in 1997 , thereby exceeding total visits to all US primary care physicians . An estimated 15 million adults in 1997 took prescription medications concurrently with herbal 
    Output:
    