. 2004 Sep 6;5:18. doi: 10.1186/1471-2296-5-18

Table 2.

Comparison of reproductive characteristics of 569 women according to education level

	No Education	Elementary	High school	University
Age (years)	59.75 ± 7.29	61.42 ± 7.50	60.23 ± 7.49	58.72 ± 7.46
Body Mass Index	27.18 ± 5.14	28.23 ± 5.63	27.72 ± 6.14	28.45 ± 5.56
Age at menarche (years)	13.77 ± 1.36	13.75 ± 1.28	14.09 ± 0.83	13.22 ± 1.38
Age at menopause (years)	45.26 ± 5.57	45.22 ± 6.72	47.25 ± 4.69	45.38 ± 5.25
Duration of fertility (years)	31.48 ± 5.73	31.47 ± 6.79	33.25 ± 4.81	32.16 ± 5.61
Duration of menopause (years)	14.49 ± 7.8	13.20 ± 8.17	12.02 ± 8.02	12.41 ± 8.73
Number of abortions	1.31 ± 1.51^{b, c}	0.94 ± 1.64	0.51 ± 1.17	0.19 ± 0.54
Number of pregnancies	7.11 ± 3.38^{a, b, c}	4.93 ± 3.61^{d, e}	2.27 ± 1.91	2.29 ± 1.39
Duration of lactation (months)	133.2 ± 54.3^{a, b, c}	93.62 ± 50.66^{d, e}	45.76 ± 38.83	57.77 ± 35.36

Values are shown as mean ± standard deviation (SD) for all variables.

^aSignificant different from elementary group, ^bSignificant different from high school group, ^cSignificant different from university group, ^dSignificant different from high school group, and ^eSignificant different from university group (p < 0.05).