Table 3. Comparison of SMI values among women in different age groups.

Age	mean1	mean2	Summary	P value
18-29y vs. 60-69y	6.074	6.386	**	0.0031
30-39y vs. 60-69y	6.325	6.386	ns	>0.9999
40-49y vs. 60-69y	6.604	6.386	ns	0.9286
50-59y vs. 60-69y	6.604	6.386	ns	>0.9999
18-39y vs. 60-69y	6.157	6.386	ns	0.0689
18-59y vs. 60-69y	6.354	6.386	ns	>0.9999
18-29y vs. ≥60y	6.074	6.248	ns	0.4326
18-39y vs. ≥60y	6.157	6.248	ns	>0.9999
18-29y vs. 30-39y	6.074	6.325	ns	0.1911