TABLE 1.
Percentage of Participants Who Initiated Smoking by Age 18 Years or Younger in the Northern Plains and Southwest American Indian Populations, by Gender and Birth Cohort: EARTH Study, 2003–2006
| Northern Plains |
Southwest |
|||
| Birth Cohort | Men, No. (%) | Women, No. (%) | Men, No. (%) | Women, No. (%) |
| 1930s and before | 72 (28) | 110 (23) | 16 (31) | 30 (10) |
| 1940–1949 | 80 (34) | 152 (33) | 44 (39) | 64 (17) |
| 1950–1959 | 200 (46) | 257 (48) | 92 (37) | 144 (18) |
| 1960–1969 | 352 (41) | 359 (43) | 158 (35) | 233 (19) |
| 1970–1979 | 387 (47) | 399 (48) | 147 (38) | 238 (30) |
| 1980–1988 | 409 (61) | 430 (58) | 171 (32) | 213 (23) |
| Ptrend | <.01 | <.01 | .5 | .01 |
Note. Sample sizes were Northern Plains men (n = 1500), Northern Plains women (n = 1707), Southwest men (n = 628), and Southwest women (n = 922).