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 | |
Geographic location | ||||||
North America | 330 37 70 74 75 | 102 33 35 36 50 51 62–67 | 62 37 70 74 75 | 562–66 | 27 74 | 337 70 74 |
Central America and the Caribbean | 0 | 933 41 47–49 71–73 | 0 | 0 | 0 | 0 |
South America | 0 | 233 42 | 0 | 0 | 0 | 0 |
Europe | 0 | 444–46 53 | 132 | 0 | 0 | 0 |
Africa | 0 | 739 40 52 57–60 | 0 | 0 | 0 | 0 |
Middle East | 0 | 533 54–56 | 0 | 0 | 0 | 0 |
Asia | 0 | 533 38 43 61 | 0 | 0 | 0 | 0 |
Oceania | 0 | 233 | 168 | 0 | 168 | 0 |
Year of data collection | ||||||
Prior to 1980 | 0 | 0 | 12 | 0 | 0 | 0 |
1980–1989 | 130 74 75 | 0 | 32 74 75 | 0 | 174 | 174 |
1990–1999 | 137 | 102 33 35 39 42 63 72 | 232 37 | 163 | 137 | 137 |
2000–2005 | 170 | 3433 36 38 40 41 43–62 64–67 71 73 | 268 70 | 462 64–66 | 168 | 170 |
Sampling frame | ||||||
Schools | 0 | 3833 35 36 38–61 71–73 | 52 32 68 | 0 | 168 | 0 |
Households | 130 74 75 | 62 62–67 | 174 75 | 562–66 | 174 | 174 |
Other§ | 237 70 | 0 | 237 70 | 0 | 137 | 237 70 |
Sample size|| | ||||||
Not stated | 0 | 22 63 | 0 | 163 | 0 | 0 |
<500 | 170 | 2333 40–42 47–49 52 54–57 59–61 71 73 | 268 70 | 0 | 168 | 170 |
500–<1000 | 0 | 833 46 62 64–67 72 | 0 | 462 64–66 | 0 | 0 |
⩾1000 | 230 37 74 75 | 1135 36 38 39 43–45 50 51 53 58 | 62 32 37 74 75 | 0 | 237 74 | 237 74 |
*We defined a study as a sample of individuals in a particular place during a particular time period.
†Although in some instances these were available from other reports,31 71 study characteristics were abstracted from The Global Youth Tobacco Survey Collaborative Group33 for the following study populations: Barbados (1999), Fiji (1999), Gaza Strip (2001), Jordan (1999), Montserrat (2000), Northern Mariana Islands (2000), Singapore (2000), Sri Lanka (1999), and St. Vincent and the Grenadines (2001). Study characteristics for Bahamas (2000) were abstracted from Perez Martin and Peruga (2002).71
‡Study characteristics for Canada (2000) were abstracted from Health Canada.66
§Other includes studies with a sampling frame that included both schools and households.37 70
||Reflects the sample size of current smokers. The sample size for age and smoking history specific subgroups as well as for the duration of cessation attempts was usually smaller. If the sample size of current smokers was not provided, wherever possible, it was estimated from (a) the total study sample size multiplied by the proportion of current smokers or (b) the large-sample 95% confidence interval for a population proportion (p±1.96*SEp) where p = prevalence and SEp = standard error of p.