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Table 2 Distribution of school level variables (all analyses involving school level variables included data from all 24 schools)

From: What explains between-school differences in rates of smoking?

  Descriptive Statistics as appropriate to scale of measurement Missing data N (%) How missing data was handled Possible reason for the missing data
Deprivation score of local area (linkage between school catchment area postcodes and Carstairs Index of Deprivation. The minimum score was -5 and maximum was 4, the higher the score the more affluent the school.) Mean = -1.33, sd = 2.1 0 (0) N/A N/A
Employment in school catchment area Mean = 10.5% unemployed, sd = 4.3% 0 (0) N/A N/A
Staying on rates from Secondary (S)4 to S5 (a score of 1 would mean everyone stayed on, so 0.77 equates to 77% staying on) Mean = 0.77, sd = 0.09 0 (0) N/A N/A
Pupils' post school destination (mean reflects those gone to higher education or a job) Mean = 72%, sd = 10.2 0 (0) N/A N/A
Free school meals Mean = 12% free meals, sd = 8.8 0 (0) N/A N/A
School attendance Mean = 90% attendance, sd = 2.7 0 (0) N/A N/A
Staying on rates from S5 to S6 (a score of 1 would mean everyone stayed on, so 0.59 equates to 59% staying on) Mean = 0.59, sd = 0.16 0 (0) N/A N/A
Access to sexual health services (The higher the score the better the access to clinics in terms of transport links from school postcodes to clinic postcodes and in terms of access to dedicated youth provision. The range minimum score was 0 and maximum was 43) Mean = 17.5, sd = 10.1 0 (0) N/A N/A
Parental placing requests for their child to attend a school (distinguishes urban from rural) Mean = 13% parents requested school placing, sd = 11.9 0 (0) N/A N/A
Proportion of pupils from ethnic minority groups Mean = 93% white, sd = 0.5 0 (0) N/A N/A
Quality of teacher relationships with each other (5 pt scale, the higher the score the poorer the quality) Mean = 2.0, sd = 0.5 0 (0) N/A N/A
Quality of teacher-pupil relationships as rated by teachers (5 pt scale, the higher the score the poorer the quality) Mean = 2.2, sd = 0.5 0 (0) N/A N/A
Size of the school (total number of pupils in S3 & S4 – the school years that SHARE would be taught) Mean = 368 puils, sd = 82.7 0 (0) N/A N/A
Quality of sex education at the school (the higher the score the better the quality of sex education in terms of teacher training, quality of teaching materials and time allocated to the topic. The range minimum was 11.2 and maximum was 26.6) Mean = 25.1, sd = 7.2 0 (0) N/A N/A