Australian secondary school students' use of tobacco, alcohol, and over-the-counter and illicit substances in 2011
2.5 - Sample size
A total of 26,194 students in Years 7 to 12 were surveyed from schools across Australia during the survey period. A total of 163 cases were removed after data cleaning due to large amounts of missing data or wildly exaggerated responses, leaving a total of 26,031 valid cases. Table 2.1 presents the number of students in each gender and age group who answered the questionnaire. A total of 24,854 students aged between 12 and 17 years who provided valid data on their gender answered it. Data from students outside this age range were excluded from the analysis, as the numbers in each age and gender group were too small to ensure reliable estimates.
Table 2.1 - Number of students surveyed in 2011 in Australia, by age and gender
|12 yrs||13 yrs||14 yrs||15 yrs||16 yr||17 yrs||12-17 yrs|