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Table 4 Results of meta-analyses with and without dissertations

From: Grey literature in systematic reviews: a cross-sectional study of the contribution of non-English reports, unpublished studies and dissertations to the results of meta-analyses in child-relevant reviews

  Number of studies Number of participants Pooled estimate (95% CI)
Summary measure
% change in effect size/CI width Difference in estimates
Review With dissertations Without dissertations % lost With dissertations Without dissertations % lost With dissertations Without dissertations   
Acute respiratory infections
 Vitamin C for preventing and treating the common cold (CD000980) 29 27 6.9 11306 11244 0.5 0.95 (0.92, 0.98)
RR
0.95 (0.93, 0.98) 0/16.7 Negligible
Infectious diseases
 Oral iron supplements for children in malaria-endemic areas (CD006589) 13 11 15.4 NR NR NA 0.99 (0.90, 1.09)
RR
0.95 (0.86, 1.05) 4.0/0.0 Negligible
Developmental, psychosocial and learning problems
 Household interventions for preventing domestic lead exposure in children (CD006047) 5 4 20.0 815 765 6.1 0.02 (−0.09, 0.12)
MD
0.00 (−0.11, 0.11) -/4.8 -
 Phonics training for English-speaking poor readers (CD009115) 10 9 10.0 683 665 2.6 0.47 (0.06, 0.88)
SMD
0.50 (0.06, 0.94) 6.4/7.3 Small
 Music therapy for people with autism spectrum disorder (CD004381) 2 1 50.0 NR NR NA 0.50 (0.22, 0.79)
SMD
0.48 (0.18, 0.77) 4.0/3.5 Negligible
 Intermittent iron supplementation for improving nutrition and development in children 3.5under 12 years of age (CD009085) 10 9 10.0 1824 1774 2.7 0.51 (0.37, 0.72)
RR
0.53 (0.38, 0.73) 3.9/0.0 Negligible
 Cognitive-behavioral treatment for antisocial behavior in youth in residential treatment (CD005650) 4 3 25.0 560 417 25.5 0.87 (0.61, 1.25) 0.84 (0.55, 1.28) 3.5/14.1 Negligible
 ‘Scared Straight’ and other juvenile awareness programs for preventing juvenile delinquency (CD002796) 7 6 14.3 794 715 9.9 1.68 (1.20, 2.36) 1.71 (1.19, 2.46) 1.8/9.5 Negligible
 Kinship care for the safety, permanency, and well-being of children removed from the home for maltreatment (CD006546) 10 5 50.0 2189 1396 36.2 −0.24 (−0.35, −0.13) −0.19 (−0.38, 0.00) 20.8/72.7 Large
(with change in statistical significance)