***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: Breastfeeding rates among low-income women in the east-south- central United States are among the lowest in the country . This study examined the effect of a peer counseling program on breastfeeding initiation and duration in a low-income rural population in West Tennessee . A postpartum survey and chart review were conducted with WIC clients at nine health departments . Response rate was 99 % ( 291/293 ) .  Breastfeeding initiation and duration at 6 weeks were increased in the peer counselor group ( n= 156 ) compared with women in the no-peer counselor group ( n= 135 ) ( 53 % vs. 33%,p<0.001 , and 26 % vs. 13%,p=0.006 , respectively ) . Multivariate analysis revealed that women in the peer counselor group were significantly more likely to initiate breastfeeding ( OR=2.43 , 95 % CI=1.23 - 4.67 ) and to be breastfeeding at 6 weeks ( OR=2.78 , 95 % CI=2.08 - 9.5 1 ) , than those in the no-peer counselor group We evaluated the single and combined effects of introducing a motivational video and peer counseling into four matched WIC clinics on breastfeeding initiation and continuation at 7 - 10 days among African-American WIC participants . Of the 242 women with complete data , 48 % initiated breastfeeding , but only 31 % were still breastfeeding at 7 - 10 days . Initiation was associated with cesarean delivery , infant feeding instruction , no artificial milk discharge pack , attending the peer counselor only-intervention site , and intention to breastfeed . Continuation was influenced by infant feeding instruction , no artificial milk discharge pack , and intention to breastfeed . Overall , trends toward a positive impact of the breastfeeding promotion activities were evident but weak , and largely gone by 7 - 10 days postpartum BACKGROUND The purpose of this demonstration project was to test the effectiveness of a volunteer peer counseling program for promoting breastfeeding in a community . METHODS The two-year project was conducted in Iowa from September 1994 to September 1996 . Both intervention and control groups were rural low-income pregnant and postpartum women who qualified for the Women , Infants and Children 's ( WIC ) nutritional program . The intervention was initiated in two counties with 143 clients , of whom 72 completed the project . The control group was drawn from six counties that had received no significant breastfeeding promotion programs during the previous three years . The intervention was the assignment of trained volunteers with previous successful personal experience with breastfeeding as peer counselors  to low-income pregnant women . Both before and after the baby was born , the volunteers taught a series of in-home , one-to-one lessons about healthy diet and breastfeeding , and maintained informal contact to answer questions or help with concerns . RESULTS Women in the intervention group improved dietary intake when compared with the control group . Knowledge of breastfeeding and good nutrition improved slightly . Eighty-two percent of intervention compared with 31 percent of control group women initiated breastfeeding . Mean duration of breastfeeding for intervention and control group women was 5.7 and 2.5 weeks , respectively . At 4 weeks , 56 percent of intervention and 10 percent of control group women were still breastfeeding . CONCLUSION A volunteer peer counseling program that provides low-income women with role models , accurate information , support , and encouragement can increase the duration of breastfeeding , and thus contribute to healthier infants BACKGROUND Breastfeeding can ameliorate some of the complex health issues faced by low-income families . Women who breastfeed and their infants have lower health care costs compared with those who formula feed . Increasing the duration of breastfeeding is recognized as a national priority , particularly for low-income women . This community-based r and omized clinical trial involving low-income mothers compared usual care with an intervention comprising hospital and home visits , and telephone support by a community health nurse/peer counselor team for 6 months after delivery . METHODS Forty-one women were recruited after delivery of a full-term singleton infant and r and omly assigned to intervention or usual care groups . RESULTS Women receiving the community health intervention  breastfed longer than the women receiving usual care . The infants in the intervention group had fewer sick visits and reported use of fewer medications than infants in the usual care group . The intervention cost ( $ 301/mother ) was partially offset by cost savings on formula and health care . CONCLUSIONS Community health nurse and peer counselor support can increase breastfeeding duration in low-income women , and has the potential to reduce total costs including the cost of support OBJECTIVE To assess the efficacy of peer counseling to promote exclusive breastfeeding ( EBF ) among low-income inner-city women in Hartford , Conn. DESIGN Participants recruited prenatally were r and omly assigned to either receive support for EBF from a peer counselor plus conventional breastfeeding support ( peer counseling group [ PC ] ) or only conventional breastfeeding support ( control group [ CG ] ) and followed through 3 months post partum . SETTING Low-income predominantly Latina community . PARTICIPANTS Expectant mothers , less than 32 weeks gestation and considering breastfeeding ( N = 162 ) . Intervention Exclusive breastfeeding peer counseling support offering 3 prenatal home visits , daily perinatal visits , 9 postpartum home visits , and telephone counseling as needed . MAIN OUTCOME MEASURES Exclusive breastfeeding rates at hospital discharge , 1 , 2 , and 3 months post partum ( n = 135 ) . RESULTS At hospital discharge , 24 % in the CG compared with 9 % in the PC had not initiated breastfeeding , with 56 % and 41 % , respectively , nonexclusively breastfeeding . At 3 months , 97 % in the CG and 73 % in the PC had not exclusively breastfed ( relative risk [ RR ] = 1.33 ; 95 % CI , 1.14 - 1.56 ) during the previous 24 hours . The likelihood of nonexclusive breastfeeding throughout the first 3 months was significantly higher for the CG than the PC ( 99 % vs 79 % ; RR = 1.24 ; 95 % CI , 1.09 - 1.41 ) . Mothers in the CG were less likely than their PC counterparts to remain amenorrheic at 3 months ( 33 % vs 52 % ; RR = 0.64 ; 95 % CI , 0.43 - 0.95 ) . The likelihood of having 1 or more diarrheal episode in infants was cut in half in the PC ( 18 % vs 38 % ; RR = 2.15 ; 95 % CI , 1.16 - 3.97 ) . CONCLUSION Well-structured , intensive breastfeeding support provided by hospital and community-based peer counselors is effective in improving exclusive breastfeeding rates among low-income , inner-city women in the United States BACKGROUND Breastfeeding peer counseling has improved breastfeeding rates in developing countries ; however , its impact in this country has not been adequately evaluated . OBJECTIVE To evaluate the effectiveness of an existing , breastfeeding peer counseling program within the United States . DESIGN R and omized , prospect i ve , controlled trial in which participants were recruited prenatally and r and omly assigned to receive either routine breastfeeding education or routine breastfeeding education plus peer counseling . SETTING An urban hospital serving a large population of low-income Latinas . PARTICIPANTS Pregnant women ( < or = 26 weeks ' gestation ) were recruited from the hospital 's prenatal clinic . Inclusion criteria specified that participants be low income , be considering breastfeeding , have delivered a healthy , full-term singleton , and have access to a telephone . Intervention Breastfeeding peer counseling services included 1 prenatal home visit , daily perinatal visits , 3 postpartum home visits , and telephone contact as needed . MAIN OUTCOME MEASURES Breastfeeding rates at birth and 1 , 3 , and 6 months postpartum . RESULTS The proportion not initiating breastfeeding was significantly lower in the intervention group than among controls ( 8/90 [ 9 % ] vs 17/75 [ 23 % ] ; relative risk , 0.39 ; 95 % confidence interval , 0.18 - 0.86 ) . The probability of stopping breastfeeding also tended to be lower in the intervention group at both 1 month ( 36 % vs 49 % ; relative risk , 0.72 ; 95 % confidence interval , 0.50 - 1.05 ) and 3 months ( 56 % vs 71 % ; relative risk , 0.78 ; 95 % confidence interval , 0.61 - 1.00 ) . CONCLUSION These findings demonstrate that , in the United States , peer counselors can significantly improve breastfeeding initiation rates and have an impact on breastfeeding rates at 1 and 3 months post partum Excess weight gain in American Indian/Alaskan native ( AI/AN ) children is a public health concern . This study tested ( 1 ) the feasibility of delivering community-wide interventions , alone or in combination with family-based interventions , to promote breastfeeding and reduce the consumption of sugar-sweetened beverages ; and ( 2 ) whether these interventions decrease  Body Mass Index ( BMI ) -Z scores in children 18–24 months of age . Three AI/AN tribes were r and omly assigned to two active interventions ; a community-wide intervention alone ( tribe A ; n = 63 families ) or community-wide intervention containing a family component  ( tribes B and C ; n = 142 families ) . Tribal staff and the research team design ed community-tailored interventions and trained community health workers to deliver the family intervention through home visits . Feasibility and acceptability of the intervention and BMI -Z scores at 18–24 months were compared between tribe A and tribes B & C combined using a separate sample pretest , posttest design . Eighty-six percent of enrolled families completed the study .  Breastfeeding initiation and 6-month duration increased 14 and 15 % , respectively , in all tribes compared to national rates for American Indians . Breastfeeding at 12 months was comparable to national data . Parents expressed confidence in their ability to curtail family consumption of sugar-sweetened beverages . Compared to a pretest sample of children of a similar age 2 years before the study begun , BMI -Z scores increased in all tribes . However , the increase was less in tribes B & C compared to tribe A ( −0.75 , P = 0.016 ) . Family , plus community-wide interventions to increase breastfeeding and curtail sugar-sweetened beverages attenuate BMI rise in AI/AN toddlers more than community-wide interventions alone This study examined the effect of support from trained peer counselors on breastfeeding initiation , duration , and exclusivity among low-income urban women .  Training of counselors , under the supervision of a registered nurse certified in lactation , adapted education techniques from Paulo Freire to provide information about lactation management and other health care issues . The study compared infant feeding practice s of women who planned to breastfeed and received support from counselors ( counselor group , N=59 ) to women who requested counselors but , owing to inadequate numbers of trained counselors , did not have a counselor ( No-counselor group , N=43 ) . Women in the counselor group had significantly greater ( p<.05 ) breastfeeding initiation ( 93 percent vs. 70 percent ) , exclusivity ( 77 percent vs. 40 percent ) , and duration ( mean of 15 weeks vs. mean of 8 weeks ) than women in the no-counselor group . The findings suggest that peer counselors , well-trained , and with on-going supervision , can have a positive effect on breastfeeding practice s among low-income urban women who intend to breastfeed 
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Since QCA is predicated on the assumption that multiple pathways might lead to the same outcome and does not assume a linear additive model in terms of changes to a particular condition ( that is , it can cope with ‘ tipping points ’ in complex interventions ) , it appears not to suffer from some of the limitations of the statistical methods often used in meta- analysis .
Results The worked example shows how the QCA reveals that our initial theories of change were unable to distinguish between ‘ effective ’ and ‘ highly effective ’ interventions .
Through the iterative QCA process , other intervention characteristics are identified that better explain the observed results .