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From: Grey literature in systematic reviews: a cross-sectional study of the contribution of non-English reports, unpublished studies and dissertations to the results of meta-analyses in child-relevant reviews

Ā 

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

Ā Ā 

Acute respiratory infections

ā€ƒVitamin 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

ā€ƒOral 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

ā€ƒHousehold interventions for preventing domestic lead exposure in children (CD006047)

5

4

20.0

815

765

6.1

0.02 (āˆ’0.09, 0.12)

MD

0.00 (āˆ’0.11, 0.11)

-/4.8

-

ā€ƒPhonics 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

ā€ƒMusic 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

ā€ƒIntermittent iron supplementation for improving nutrition and development in children 3.5under 12Ā 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

ā€ƒCognitive-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

ā€ƒā€˜Scared Straightā€™ 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

ā€ƒKinship 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

āˆ’0.24 (āˆ’0.35, āˆ’0.13)

āˆ’0.19 (āˆ’0.38, 0.00)

20.8/72.7

Large

(with change in statistical significance)