Table 3 Number of national population‐based estimates* according to period of adolescence, level of cigarette consumption and type of cessation attempt estimate.
| Characteristic | Number of estimates | |||||
|---|---|---|---|---|---|---|
| Any cessation attempt | Multiple† cessation attempts | |||||
| 6‐month prevalence§ | 12‐month prevalence|| | Lifetime prevalence§ | 12‐Month prevalence | Lifetime prevalence | Duration of cessation attempt‡ | |
| Period of adolescence | ||||||
| Early | – | 738,39,40,41,42 | – | – | – | – |
| Early to middle | 737,70,75 | 1435,36,42,43,44,45,46,53,54,55,57,59,60 | 937,68,70,75 | – | 337,68,74 | 537,70,74 |
| Middle | 175 | 4433,38,39,40,41,42,47,48,49,50,51,56,71 | 175 | – | 174 | 174 |
| Early to late | 730,37,75 | 122,38,40,41,47,48,49,52,61,72,73 | 537,75 | – | 237,74 | 437,74 |
| Middle to late | 537 | 1435,36,50,51,58,62,63,64,65,66,67 | 732,37,68 | 862,63,64,65,66,67 | 237,68 | 337 |
| Late | 175 | 1538,39,40,41,49,50,51,62,63,64,65,66,67 | 72,75 | 562,63,64,65,66 | 174 | 174 |
| Smoking status | ||||||
| Self‐defined current | – | 1362,63,64,65,66,67 | 132 | 1362,63,64,65,66,67 | – | – |
| Past week | 170 | – | 170 | – | – | 170 |
| Past month | 2030,37,75 | 932,33,35,36,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,71 | 272,37,68,75 | – | 937,68,74 | 1337,74 |
| Smoking frequency | ||||||
| Any use | 1337,75 | 932,33,35,36,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61 | 182,37,68,75 | – | 937,68,74 | 737,74 |
| Daily¶ | 530,37,70 | 1362,63,64,65,66,67 | 82,32,37,70 | 1362,63,64,65,66,67 | – | 437,70 |
| Non‐daily | 337 | – | 337 | – | – | 337 |
| Cumulative lifetime consumption | ||||||
| ⩾100 cigarettes | 1430,37,75 | 12 | 937 | – | 337 | 937 |
| <100 cigarettes | 337 | 12 | 337 | – | – | – |
| Any consumption/not stated | 437,70 | 10433,35,36,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,71 | 172,32,37,68,70,75 | 1362,63,64,65,66,67 | 668,74 | 570,74 |
*The estimate, not the study, is the unit of analysis for this table. A single study could report multiple age‐ and smoking history‐specific estimates.
†Studies differed in how multiple cessation attempts were categorised. Categories of ⩾2, ⩾3, and/or ⩾4 cessation attempts could be derived, although not across all studies. If more than one of these cessation attempt frequency categories could be derived for a given smoking characteristic and period of adolescence stratum, then, collectively, they were considered as a single estimate of the prevalence of multiple cessation attempts for that stratum (table 4).
‡Studies differed in how the length of abstinence was categorised. Durations of ⩽1 week, ⩽1 month, ⩽6 months and/or ⩽1 year could be derived, although not across all studies. If more than one of these duration categories could be derived for a given level of cigarette consumption and period of adolescence stratum, then, collectively, they were considered as a single estimate of the duration of the cessation attempt for that stratum (table 5).
§Three reports30,74,75 were based on the 1989 US Teenage Attitudes and Practices Survey. When estimates for duplicate age and/or smoking history strata were available, only Moss et al75 was considered in the calculation of summary estimates.
||Three reports provided duplicate estimates from several of the same populations.31,33,71 When estimates for duplicate age and or smoking history strata were available, they were abstracted from The Global Youth Tobaccos Survey Collaborative Group.33
¶Several studies provided a more detailed breakdown of consumption within the “daily” smoking category.30,37 In such instances only one aggregate age‐specific estimate among daily smokers was counted in tabulating the number of estimates.