Demographics of Student Populations: Pre- and Post-test χ2 Analysis Results*
| Demographic Variable: | Pretest (n, percentage of total) N = 2929 | Post-test (n, percentage of total) N = 2766 |
|---|---|---|
| Age (years) | ||
| 9 years old | 38 (1.3) | 40 (1.5) |
| 10 years old | 1047 (35.8) | 924 (33.4) |
| 11 years old | 1620 (55.4) | 1513 (54.7) |
| 12 years old | 173 (5.9) | 160 (5.8) |
| 13 years old | 15 (0.5) | 24 (0.9) |
| Missing | 33 (1.1) | 105 (3.8) |
| Race | ||
| White | 2236 (76.4) | 2067 (74.7) |
| Other | 368 (12.6) | 325 (11.8) |
| Missing | 322 (11.0) | 374 (13.5) |
| Ethnicity | ||
| Hispanic | 529 (18.1) | 452 (16.3) |
| Not Hispanic | 2159 (73.8) | 1949 (70.5) |
| Missing | 238 (8.1) | 365 (13.2) |
| Gender | ||
| Boy | 1475 (50.4) | 1360 (49.2) |
| Girl | 1416 (48.4) | 1297 (46.9) |
| Missing | 35 (1.2) | 109 (3.9) |
| Smoker in Household | ||
| Yes | 975 (33.3) | 950 (34.4) |
| No | 1904 (65.1) | 1792 (64.8) |
| Missing | 47 (1.6) | 47 (0.9) |
| Current tobacco user | ||
| Yes | 10 (0.3) | 22 (0.8) |
| No | 2774 (94.8) | 2725 (98.5) |
| Missing | 142 (4.9) | 19 (0.7) |
* No statistically significant differences between pre- and post-tests demographically, P > .05.