***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: Objectives : To study the prevalence of hypovitaminosis D , the effect of vitamin D supplementation on serum 25-hydroxyvitamin D [ S-25(OH)D ] , and the intakes of vitamin D and calcium in Finnish 9− to 15-year-old athletic and nonathletic girls . Design : 1-year follow-up study ( February 1997-March 1998 ) with three months of vitamin D supplementation ( 10 μg/d ) from October to January . Setting : Turku University Central Hospital , Finl and .Subjects : 191 female volunteers aged 9–15 y ( 131 athletes and 60 controls ) . Methods :  Vitamin D and calcium intakes were estimated by a four-day food recording and a semi-quantitative food frequency question naire ( FFQ ) . S-25(OH)D was followed by radioimmunoassay ( RIA ) . Results : At baseline the mean S-25(OH)D concentration was 33.9 nmol/l among all girls . In winter severe hypovitaminosis D ( S-25(OH)D<20 nmol/l ) occurred in 13.4 % of the participants and in 67.7 % S-25(OH)D was below 37.5 nmol/l . By the next summer the mean S-25(OH)D concentration was 62.9 nmol/l and in 1.6 % of the subjects it was below 37.5 nmol/l . The prevalence of severe hypovitaminosis D was not significantly reduced by three months of vitamin D ( 10 μg/d ) supplementation . At baseline , the mean intake of vitamin  D was 2.9 μg/d by food recording and 4.3 μg/d by FFQ . The mean calcium intake was 1256 mg/d and 1580 mg/d , respectively . The intakes of vitamin D and calcium remained unchanged during the follow-up period . The athletes consumed more calcium than nonathletic controls , whereas the intake of vitamin D was quite similar among both groups . The vitamin D intake by FFQ correlated with the S-25(OH)D concentration in wintertime ( r=0.28 , P<0.01 ) . Conclusion : Hypovitaminosis D is fairly common in growing Finnish girls in the wintertime , and three months of vitamin D supplementation with 10 μg/d was insufficient in preventing hypovitaminosis D. The daily dietary vitamin D intake was insufficient ( < 5 μg/d ) in the majority of participants , while the calcium intake was usually sufficient . Sponsorship : Supported by the Yrjö Jahnsson Foundation , The Turku University Foundation , and the Medical Research Foundation of the Turku University Central Hospital Objective To investigate whether vitamin D supplementation can decrease the mortality and morbidity of low birthweight infants in low income countries . Design R and omised controlled trial . Setting Large government hospital in New Delhi , India . Participants 2079 low birthweight infants born at term ( > 37 weeks ’ gestation ) . Main outcome measures Primary outcome was admission to hospital or death during the first six months of life . Main secondary outcome was growth . Interventions Weekly vitamin D supplements for six months at a dose of one recommended nutrient intake per day ( 35 µg/week ) . Infants were visited weekly at home for observed supplementation and were brought to the clinic monthly for clinical examination and anthropometric measurements . Results Between group differences were not significant for death or hospital admissions ( 92 among 1039 infants in the vitamin D group v 99 among 1040 infants in the placebo group ; adjusted rate ratio 0.93 , 95 % confidence interval 0.68 to 1.29 ; P=0.68 ) , or referral to the outpatient clinic for moderate morbidity  . Vitamin D supplementation result ed in better vitamin D status as assessed by plasma calcidiol levels at six months . In adjusted analyses , vitamin D treatment significantly increased st and ard deviation ( z ) scores at six months for weight , length , and arm circumference and decreased the proportion of children with stunted growth ( length for age z score ≤2 ) or with arm circumference z scores of 2 or less . Conclusion A weekly dose of vitamin D result ed in better vitamin D status and benefited the classic vitamin D function of bone growth but did not decrease the incidence of severe morbidity or death among young low birthweight infants . Trial registration Clinical Trials.gov NCT00415402 BACKGROUND Provision of fortified juices may provide a convenient method to maintain and increase blood fat-soluble vitamins . OBJECTIVE To determine whether children consuming orange juice fortified with calcium and combinations of vitamins D , E , and A  could increase serum 25-hydroxyvitamin D [ 25(OH)D ] , α-tocopherol , and retinol levels . DESIGN A 12-week r and omized , double-blind , controlled trial . PARTICIPANTS / SETTING One hundred eighty participants ( aged 8.04±1.42 years ) were recruited at Tufts ( n=70 ) and Boston University ( n=110 ) during 2005 - 2006 . Of those recruited , 176 children were r and omized into three groups : CaD ( 700 mg calcium+200 IU vitamin D ) , CaDEA ( 700 mg calcium+200 IU vitamin D+12 IU vitamin E+2,000 IU vitamin A as beta carotene ) , or Ca ( 700 mg calcium ) . Children consumed two 240-mL glasses of CaD , CaDEA , or Ca fortified orange juice daily for 12 weeks . MAIN OUTCOME MEASURES Serum 25(OH)D , α-tocopherol , and retinol concentrations . STATISTICAL ANALYSES Changes in 25(OH)D , α-tocopherol , retinol , and parathyroid hormone concentrations were examined . Covariates included sex , age , race/ethnicity , body mass index , and baseline 25(OH)D , α-tocopherol , retinol , or parathyroid hormone levels . Multivariate models and repeated measures analysis of variance tested for group differences with pre-post measures ( n=141 ) . RESULTS Baseline 25(OH)D was 68.4±27.7 nmol/L ( 27.4±11.10 ng/mL ) ) , with 21.7 % of participants having inadequate 25(OH)D ( < 50 nmol/L [ 20.03 ng/mL ] ) . The CaD group 's 25(OH)D increase was greater than that of the Ca group ( 12.7 nmol/L [ 5.09 ng/mL ] , 95 % CI 1.3 to 24.1 ; P=0.029 ) . The CaDEA group 's increase in α-tocopherol concentration was greater than that in the Ca or CaD groups ( 3.79 μmol/L [ 0.16 μg/mL ] , 95 % CI 2.5 to 5.1 and 3.09 μmol/L [ 0.13 μg/mL ] , 95 % CI -1.8 to 4.3 ) , respectively ( P<0.0001 ) . Retinol levels did not change , and body weight remained as expected for growth . CONCLUSIONS Daily consumption of orange juice providing 200 IU vitamin D and 12 IU vitamin E increased 25(OH)D and α-tocopherol concentrations in young children within 12 weeks Concentrations of serum alkaline phosphatase and total urinary hydroxyproline were measured in 36 children to study the effect of phenobarbital administration with respect to the development of rickets in patients receiving anticonvulsive medications over prolonged periods of time . Administration of phenobarbital led to the appearance of increased AP and HOP values very early in the course of treatment and without any obvious bone changes suggestive of rickets ; a single large oral dose of vitamin D had no appreciable effects in restoring the biochemical derangement . On the other h and , the administration of vitamin D in a daily dose of 4,000 IU for a period of two months hampered the appearance , or restored already existing changes of latent rickets , in children receiving anticonvulsive medication . The results in the present study favor the concept that phenobarbital administration is implicated in the development of rickets . The need for simultaneous daily administration of supplements of vitamin D in subjects receiving anticonvulsive drugs is stressed The hypothesis that breastfed infants in Beijing , China , have low vitamin D status and that sunshine exposure increases serum 25-hydroxyvitamin D ( 25-OHD ) concentrations was tested in a r and omized prospect i ve study involving 42 healthy infants 1 - 8 months of age . 24 controls were exposed to the usual amount of sunshine , while the 18 cases were provided with 2 hours of sunshine/day . All infants were being breastfed without vitamin D supplementation .  Serum 25-OHD concentrations at entry into the study ranged from 3 - 61 ng/ml and increased with age . 3 infants in each group were diagnosed as having rickets . Serum 25-OHD concentrations did not change significantly during the 2-month study period among controls , while serum 25-OHD values increased significantly in the experimental group . Final infant serum 25-OHD concentrations correlated with ultraviolet exposure scores ( p.001 ) . The estimate of ultraviolet score needed to maintain a serum 25-OHD of 11 ng/ml was 2.4 ( 24 minutes/day with only the face uncovered ) . Rickets has been reported in as many as 18 % of Chinese infants and seems to especially affect those 2 - 4 months of age . The fact that not all infants with rickets in this study had low 25-OHD concentrations suggests 2 possibilities : 1 ) not all rickets is necessarily related to a vitamin D deficiency , or 2 ) serum 25-OHD concentrations are not the best indicator of vitamin D status . The low serum 25-OHD concentrations in many Chinese infants may be related to low maternal milk vitamin D content result ing from the lack of vitamin D food fortification . Overall , these results suggest that the diet of breastfed Chinese infants should be supplemented with orally administered vitamin OBJECTIVE : Observational studies suggest that serum levels of 25-hydroxyvitamin D ( 25[OH]D ) are inversely associated with acute respiratory infections ( ARIs ) . We hypothesized that vitamin D supplementation of children with vitamin D deficiency would lower the risk of ARIs . METHODS : By using cluster r and omization , classrooms of 744 Mongolian schoolchildren were r and omly assigned to different treatments in winter ( January – March ) . This analysis focused on a subset of 247 children who were assigned to daily ingestion of unfortified regular milk ( control ; n = 104 ) or milk fortified with 300 IU of vitamin D3 ( n = 143 ) . This comparison was double-blinded . The primary outcome was the number of parent-reported ARIs over the past 3 months . RESULTS : At baseline , the median serum 25(OH)D level was 7 ng/mL ( interquartile range : 5–10 ng/mL ) . At the end of the trial , follow-up was 99 % ( n = 244 ) , and the median 25(OH)D levels of children in the control versus vitamin D groups was significantly different ( 7 vs 19 ng/mL ; P < .001 ) . Compared with controls , children receiving vitamin D reported significantly fewer ARIs during the study period ( mean : 0.80 vs 0.45 ; P = .047 ) , with a rate ratio of 0.52 ( 95 % confidence interval : 0.31–0.89 ) . Adjusting for age , gender , and history of wheezing , vitamin D continued to halve the risk of ARI ( rate ratio : 0.50 [ 95 % confidence interval : 0.28–0.88 ] ) . Similar results were found among children either below or above the median 25(OH)D level at baseline ( rate ratio : 0.41 vs 0.57 ; Pinteraction = .27 ) . CONCLUSIONS : Vitamin D supplementation significantly reduced the risk of ARIs in winter among Mongolian children with vitamin D deficiency OBJECTIVE To estimate the prevalence of and risk factors for  vitamin D deficiency in young urban children in Auckl and , New Zeal and , where there is no routine vitamin  D supplementation . DESIGN A r and om sample of urban children . Vitamin D deficiency was defined as serum 25-hydroxyvitamin D < 27.5 nmol/l ( < 11 ng/ml ) . Logistic regression analysis was used to calculate odds ratios and , from these , relative risks ( RR ) and 95 % confidence intervals were estimated . SETTING Auckl and , New Zeal and ( 36 degrees 52 'S ) , where the daily vitamin D production by solar irradiation varies between summer and winter at least 10-fold . SUBJECTS Children aged 6 to 23 months enrolled from 1999 to 2002 . RESULTS Vitamin D deficiency was present in forty-six of 353 ( 10 % ; 95 % 
    Output:
    
In these two trials there were no obvious differences between supplemented and unsupplemented children regarding episodes of diarrhoea .
This may be due to time elapsed at measurement from the last dose , incomplete compliance , or increased need of vitamin D with infant age .