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Table 4 Right-sided ovulation (R) and left-sided ovulation (L) in infertile and fertile 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

Infertile women

 R(LR + RR)

32.6 ± 4.2

380

220/160

1.375

1.00 control

 

 L(RL + LL)

33.0 ± 4.0

277

133/144

0.924

0.67 0.49–0.92

0.0140

 Total

32.8 ± 4.1

657

353/304

1.161

  

Fertile women

 R

32.4 ± 4.3

420

217/203

1.069

1.00 control

 

 L

32.8 ± 4.1

264

133/131

1.015

0.95 0.70–1.29

0.7539

 Total

32.6 ± 4.2

684

350/334

1.048

  

Infertile + Fertile women

 R

32.5 ± 4.3

800

437/363

1.204

1.00 control

 

 L

32.9 ± 4.0

541

266/275

0.967

0.80 0.65–1.00

0.0498

 Total

32.7 ± 4.2

1341

703/638

1.102