Table 2.

Mean Age of Onset by Latitude Range (N = 6972)

Latitude Range North + South	Mean Age of Onset	N	Standard Deviation
0–9	26.6	511	9.97
10–19	24.3	797	9.49
20–29	24.8	375	11.39
30–39	25.5	2023	10.38
40–49	26.6	2368	10.59
50–59	24.4	682	10.16
60–69	22.7	216	11.29
Total	25.6	6972	10.43