Table 1:

Mean N/M for each decade of life/age groups.

Age categories (years)	Minimum	Maximum	Mean	Std. deviation	CI
20–29 (n=10)	0.28	0.75	0.510	0.129	0.417–0.602
30–39 (n=30)	0.30	0.57	0.427	0.080	0.398–0.458
40–49 (n=51)	0.24	0.69	0.449	0.104	0.420–0.497
50–59 (n=68)	0.27	0.64	0.444	0.083	0.425–0.465
60–69 (n=32)	0.33	0.93	0.465	0.109	0.426–0.505
≥70 (n=27)	0.22	0.65	0.450	0.099	0.410–0.488
Total (n=218)	0.22	0.93	0.450	0.097	0.437–0.463