Table 1

Sample size and student response rate by year

YearNZ Year 10
population
Valid survey responses*Valid survey responses that met all study inclusion criteriaProportion of Year-10 population that met all study inclusion criteria (%)
200258 81229 17328 08850
200361 02832 70531 37754
200462 85231 63030 80746
200564 61932 56131 83351
200663 08632 84431 69052
200762 01225 97825 10942
200861 48530 90329 68250
200961 35525 75724 75542
201061 21032 83231 69654
201159 56226 85626 02845
201259 62731 98330 39643
201357 92928 34027 01449
201459 61231 12529 30347
201559 52821 56720 44336
Total 852 717 414 254 398 221 47
  • *Valid survey responses=those with complete data for age (14 or 15), sex, ethnicity and smoking status.

  • NZ, New Zealand.