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Table 2 Sample size and demographics for genetic analyses

From: Validation and psychometric properties of the Somatic and Psychological HEalth REport (SPHERE) in a young Australian-based population sample using non-parametric item response theory

Age Bins:

8 to 12 years

13 to 14 years

15 to 16 years

17 to 28 years

Total number of observations

1492

1552

1683

959

Number of repeated observations excluded (same participant with two questionnaires in age bin)

53

154

108

25

Number of observations from identical triplet or extra siblings (excluded)

57

27

67

47

Final sample size (individuals) for genetic analyses

1382

1371

1508

887

Incl.

N complete twin pairs

634

603

670

242

Incl.

N MZ pairs

226

209

230

96

N DZ pairs

408

394

440

146

N extra sibling

84

114

89

62

N twin-sibling pair

1

1

0

23

N singletons

28

49

79

295

Incl.

N twins

8

8

15

96

N siblings

20

41

64

199

Mean age (SD) [range]

12.09 (0.41) [9,10,11,12]

14.15 (0.31) [13, 14]

16.16 (0.37) [15, 16]

19.69 (1.92) [17,18,19,20,21,22,23,24,25]

% Females

50%

50%

54%

58%