Table 3.

Menstrual history and breastfeeding duration of the study groups

Parameter	Control (n = 218)	Case (n = 214)	P-value
Age of started menstruation
< 10 years old	1 (0.5)	25 (11.7%)	< 0.001
11–14 years old	196 (89.9%)	150 (70.1%)
> 15 years old	21 (9.6%)	39 (18.2%)
Age at menopause
< 35 years old	2 (0.9%)	8 (3.7%)	0.271
36–40 years old	25 (11.5%)	16 (7.5%)
41–45 years old	68 (31.2%)	46 (21.5%)
> 46 years old	123 (56.4%)	144 (67.3%)
Breastfeeding duration
No	51 (23.4%)	40 (18.7%)	0.052
Yes	167 (76.6%)	174 (81.3%)
< 6 months	76 (45.5%)	48 (27.6%)
6–12 months	42 (25.1%)	70 (40.2%)
> 13 months	49 (29.4%)	56 (32.2%)

Values are expressed as frequency (%)

Duration of breast feeding is average for each pregnancy

P-values are obtained by x² test