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Table 2 Numbers of cases, relative risks (RR) and 95% confidence limits (CL) for schizophrenia, by standard month of birth and sex.

From: Acute maternal stress in pregnancy and schizophrenia in offspring: A cohort prospective study

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. 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.