n | Low-stable | Moderate to low | Moderate | High to low | P value* |
534 | 1285 | 128 | 132 | ||
Mean±SD | |||||
Exposure levels (min/day) | |||||
0 year (baseline) | 29.8±27.6 | 65.79±126.2 | 77.3±97.4 | 295.2±277.8 | <0.0001 |
2 years | 21.9±21.4 | 45.8±83.7 | 62.8±76.4 | 227.4±244.3 | <0.0001 |
4 years | 30.1±39.8 | 21.5±26.1 | 36.9±55.7 | 78.5±125.0 | <0.0001 |
6 years | 35.1±47.2 | 17.8±27.0 | 32.4±66.0 | 60.7±98.0 | 0.0002 |
8 years | 15.8±18.0 | 19.3±26.2 | 37.5±57.9 | 56.0±80.9 | 0.1362 |
10 years | 22.5±23.6 | 12.3±13.4 | 35.6±52.8 | 45.8±51.0 | 0.0254 |
12 years (endline) | 26.2±22.1 | 28.9±44.4 | 38.1±52.4 | 33.1±55.9 | 0.5368 |
*The bold values are statistically significant.
SHS, secondhand smoke.