Table 2

Numbers of cases, relative risks (RR) and 95% confidence limits (CL) for schizophrenia, by standard month of birth and sex.

Estimated gestational month in June 1967

Date of birth

Total, including unknown sex

Males

Females




Cases

RR1

95% CL1

Cases

RR

95% CL1

Cases

RR

95% CL1


1

Feb 1968

5

1.09

0.44–2.72

5

2.01

0.81–5.41

0

-

-

2

Jan 1968

9

** 2.28

1.12–4.65

3

1.17

0.36–3.83

6

*** 4.33

1.71–11.0

3

Dec 1967

3

0.76

0.24–2.44

1

0.43

0.06–3.16

2

1.23

0.29–5.28

4

Nov 1967

4

1.07

0.38–3.00

3

1.30

0.40–4.27

1

0.71

0.09–5.34

5

Oct 1967

4

0.82

0.30–2.27

3

1.17

0.36–3.83

1

0.44

0.06–3.22

6

Sept 1967

4

0.99

0.36–2.74

2

0.92

0.22–3.88

2

1.06

0.25–4.50

7

Aug 1967

1

0.26

0.04–1.89

0

-

-

1

0.94

0.12–7.22

8

Jul 1967

4

0.97

0.35–2.67

1

0.45

0.06–3.26

3

1.58

0.47–5.30

9

Jun 1967

3

0.64

0.20–2.03

1

0.35

0.05–2.57

2

1.07

0.25–4.55


Comparison group (all others)

1964–76

602

1

reference

355

1

reference

245

1

reference


1. Adjusted for paternal age (continuous), maternal age (30–34, 35+ versus all others), low social class (father's occupation group 5,6 versus 1–4), years married and month of birth. 2. Additionally adjusted for sex. ** p < .03; *** p < .003.

Malaspina et al. BMC Psychiatry 2008 8:71   doi:10.1186/1471-244X-8-71

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