null New sample invitation 2/2/00: no questionnaire, letter only inviting the remaining
100 schools in the relevant strata/regions to participate in research.
nullnull New sample mail-out 4/5/00: complete packages sent out to new sample.
nullnullnull New sample follow-up 5/6/00: complete packages.
Fig. A5.2 New sample responses histogram (summed per week)
Total no. responses from main sample = 42/199 (21.1%)
Total no. responses from new sample = 39/100 (39.0%)
Total no. responses overall = 81/299 (27.1%)