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Table 2 Four possible ovulation patterns in two consecutive menstrual cycles of infertile women, mean ages at conception and associated offspring sex ratios

From: Ovulation patterns affect the offspring sex ratios and change with the women’s age

Ovulation pattern

Mean age#

No

Male/female*

Sex ratio

OR 95% CI

P-value

LR (LLR + RLR)

32.0 ± 4.1$

199

122/77

1.584

1.00 control

 

RR (LRR + RRR)

33.3 ± 4.2

181

98/83

1.181

0.75 0.50–1.12

0.1766

RL (RRL + LRL)

32.9 ± 3.8

174

93/81

1.148

0.72 0.48–1.09

0.1417

LL (RLL + LLL)

33.1 ± 4.2

103

40/63

0.635

0.40 0.25–0.63

0.0003

Total

32.8 ± 4.1

657

353/304

1.161

  
  1. R: right-sided ovulation; L: left-sided ovulation
  2. #ANOVA, P = 0.0254. $The mean age of LR was significantly younger than that of RR, or LL (all P < 0.05). OR 95% CI: odds ratio 95% confidence intervals. *Heterogeneity × 2 test: P = 0.0032
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Reproductive Health

ISSN: 1742-4755