Participant characteristics by sex
| General n=1257 | Men n=611 | Women n=646 | |
|---|---|---|---|
| Freq. (%) | Freq. (%) | Freq. (%) | |
| Age (years) | |||
| ≤12 | 177 (14.6) | 103 (17.4) | 74 (12.0)* |
| 13 | 303 (25.1) | 149 (25.2) | 154 (24.9) |
| 14 | 270 (22.3) | 140 (23.7) | 130 (21.0) |
| 15 | 303 (25.1) | 136 (23.0) | 167 (27.0) |
| ≥16 | 156 (12.9) | 63 (10.7) | 93 (15.1) |
| School grade | |||
| Seventh grade | 407 (32.5) | 210 (34.5) | 197 (30.5)* |
| Eighth grade | 263 (21.0) | 132 (21.7) | 131 (20.3) |
| Ninth grade | 377 (30.1) | 185 (30.4) | 192 (29.8) |
| First high school | 206 (16.4) | 81 (13.3) | 125 (19.4) |
| Smoked in the past 30 days? | |||
| No | 994 (79.1) | 478 (78.2) | 516 (79.9) |
| Yes | 263 (20.9) | 133 (21.8) | 130 (20.1) |
| Number of cigarettes per day | |||
| ≤1 cigarette | 193 (73.4) | 91 (68.4) | 102 (78.5) |
| 2–5 cigarettes | 57 (21.7) | 32 (24.1) | 25 (19.2) |
| 6 or more cigarettes | 13 (4.9) | 10 (7.5) | 3 (2.3) |
| Smoking days over the past 30 days | |||
| 1–2 days | 134 (51) | 66 (49.6) | 68 (52.3) |
| 3–5 days | 52 (19.8) | 30 (22.6) | 22 (16.9) |
| 6–9 days | 29 (11.0) | 11 (8.3) | 18 (13.8) |
| 10–19 days | 19 (7.2) | 11 (8.3) | 8 (6.2) |
| 20–29 days | 12 (4.6) | 4 (3.0) | 8 (6.2) |
| Daily | 17 (6.5) | 11 (8.3) | 6 (4.6) |
Cuernavaca and Mexico City, 2011.