Table 1

Characteristics of Studies Reporting on School Absences.*

Study

    Intervention Group

    Control Group

Duration (Months)

Standardized Effect Size**

N

Mean ± SD

Rate

N

Mean ± SD

Rate


Charlton

42

2.10 ± 11.40

0.18

37

4.70 ± 15.50

0.39

12

-0.19

Christiansen

27

2.39 ± 2.90

0.20

15

2.98 ± 3.29

0.25

12

-0.19

Colland

45

0.98 ± 1.56

0.16

34

0.53 ± 1.08

0.09

6

0.32

Dahl

9

0.80 ± 0.32

0.8

10

0.90 ± 0.32

0.9

1

-0.30

Deaves

32

3.69 ± 4.80

0.31

31

5.19 ± 4.80

0.43

12

-0.31

Evans

117

19.40 ± 13.90

1.62

87

19.70 ± 12.60

1.64

12

-0.02

Fireman

13

0.50 ± 5.06

0.04

13

4.60 ± 5.06

0.38

12

-0.78

Hill

211

5.43 ± 4.07

1.36

193

6.23 ± 4.72

1.56

4

-0.18

Hughes

44

10.70 ± 6.90

0.89

45

16.00 ± 15.40

1.33

12

-0.44

Mitchell

133

7.92 ± 16.48

1.32

126

8.48 ± 26.69

1.41

6

-0.03

Perrin

29

0.24 ± 0.90

0.24

27

0.22 ± 1.00

0.22

1

0.02

Persaud

18

6.40 ± 4.60

1.28

18

7.60 ± 5.30

1.52

5

-0.24

Rubin

29

11.90 ± 7.80

0.99

25

15.40 ± 15.00

1.28

12

-0.30

Talabere

25

1.36 ± 2.52

0.45

25

2.60 ± 3.75

0.87

3

-0.38

Toelle

63

2.62 ± 3.28

0.44

51

2.67 ± 3.21

0.45

6

-0.02

Wilson

30

0.80 ± 2.29

0.80

29

1.40 ± 3.23

1.40

1

-0.21


* N refers to the sample size, Mean ± SD refers to the mean number of events ± standard deviation, and rate refers to the total events per person-month. ** Standardized effect size was calculated for each study by subtracting control group mean from intervention group mean and dividing by the pooled SD.

Guevara et al. BMC Medical Research Methodology 2004 4:17   doi:10.1186/1471-2288-4-17

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