Table 3.
Distributions of number of cigarettes smoked and DSM-IV nicotine dependence criteria by number of months after smoking onset among all current smokers and by prior and subsequent smoking status (N=409)
| 2. Smokers by smoking in prior period | 3. Smokers by smoking in next period | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. All current smokers | (a) Smoked |
(b) Had stopped |
(c) Continued to smoke |
(d) Stopped smoking |
|||||||||||
| Number of months after smoking onset |
Mean | SD | N | Mean | SD | N | Mean | SD | N | Mean | SD | N | Mean | SD | N |
| Maximum monthly cigarettes smoked in each period |
|||||||||||||||
| 1- 6 months | 22.6 | 87.3 | (398) | --- | --- | --- | --- | --- | --- | 56.9 | 140.3 | (136) | 3.1 | 17.3 | (244)*** |
| 7-12 months | 70.7 | 168.6 | (139) | 70.7 | 168.6 | (139) | --- | --- | --- | 75.0 | 124.0 | (94) | 36.6 | 197.1 | (39) |
| 13-18 months | 69.3 | 117.0 | (144) | 90.6 | 126.5 | (97) | 27.6 | 77.3 | (47)*** | 91.4 | 128.5 | (97) | 18.2 | 59.7 | (36)*** |
| 19-24 months | 84.7 | 185.7 | (140) | 127.3 | 234.7 | (74) | 34.4 | 81.9 | (66)*** | 97.6 | 201.2 | (94) | 35.4 | 75.1 | (30)** |
| 25-30 months | 85.1 | 171.4 | (127) | 144.7 | 225.7 | (57) | 36.5 | 78.0 | (70)*** | 103.2 | 162.4 | (50) | 14.9 | 36.3 | (22)*** |
| 31-36 months | 85.1 | 165.4 | (67) | 190.5 | 234.8 | (23) | 27.6 | 56.7 | (44)*** | 95.3 | 170.2 | (43) | 65.4 | 161.5 | (23) |
| 79-90 months | 127.5 | 225.7 | (213) | 183.2 | 295.8 | (69) | 99.1 | 177.8 | (144)* | --- | --- | --- | --- | --- | --- |
| DSM-IV dependence criteria in each period |
|||||||||||||||
| 1- 6 months | 0.6 | 1.3 | (409) | --- | --- | --- | --- | --- | --- | 1.3 | 1.7 | (139) | 0.2 | 1.8 | (245)*** |
| 7-12 months | 1.5 | 1.7 | (139) | 1.5 | 1.7 | (139) | --- | --- | --- | 1.8 | 1.6 | (94) | 0.8 | 1.5 | (39)*** |
| 13-18 months | 1.5 | 1.6 | (143) | 1.7 | 1.6 | (97) | 1.2 | 1.6 | (46)* | 1.7 | 1.7 | (96) | 1.0 | 1.5 | (36)* |
| 19-24 months | 1.5 | 1.7 | (135) | 1.8 | 1.7 | (71) | 1.3 | 1.6 | (64) | 1.6 | 1.7 | (92) | 1.2 | 1.3 | (29) |
| 25-30 months | 1.3 | 1.6 | (127) | 1.5 | 1.5 | (57) | 1.1 | 1.7 | (70) | 1.6 | 1.7 | (50) | 0.9 | 1.0 | (22)* |
| 31-36 months | 1.1 | 1.5 | (63) | 1.3 | 1.9 | (20) | 1.0 | 1.4 | (43) | 1.2 | 1.7 | (40) | 1.0 | 1.4 | (22) |
| 79-90 months | 2.0 | 1.9 | (213) | 2.2 | 2.0 | (69) | 1.9 | 1.9 | (144) | --- | --- | --- | --- | --- | --- |
*
p<.05,
**
p<.01,
***
p<.001.
Difference between (a) & (b) or (c) & (d).