Table 1.

Percentage FM in healthy non-Hispanic white men and women. Adapted from NHANES III [10].

Age range (years)	Males (%)	Females (%)	Difference (%)
12–13.9	18.4	24.8	6.4
20–29.9	21.8	31.0	8.2
30–39.9	23.6	33.0	9.4
40–49.9	24.2	35.4	11.2
50–59.9	25.1	37.3	12.2
60–69.9	26.2	36.9	10.7
70–79.9	25.1	35.9	10.8