Descriptive characteristics of participants by year
| Variable | Year | ||||
| 2013 (n=1226) | 2014 (n=1104) | 2015 (n=3005) | 2016 (n=2889) | 2017 (n=2963) | |
| School* | |||||
| Urban/high deprivation | 313 (26) | 280 (25) | 683 (23) | 613 (21) | 667 (23) |
| Urban/medium-low deprivation | 277 (23) | 264 (24) | 717 (24) | 757 (26) | 768 (26) |
| Semiurban/high deprivation | 305 (25) | 259 (23) | 724 (24) | 722 (25) | 711 (24) |
| Semiurban/medium-low deprivation | 331 (25) | 301 (27) | 881 (29) | 797 (28) | 817 (28) |
| Mode of transport | |||||
| Walking | – | 571 (52) | 1520 (51) | 1424 (49) | 1496 (50) |
| Car, motorcycle or moped | – | 146 (13) | 395 (13) | 413 (14) | 437 (15) |
| Bus, train, tram, UG or boat | – | 359 (33) | 1027 (34) | 994 (34) | 960 (32) |
| Bicycle | – | 5 (0) | 11 (0) | 8 (0) | 11 (0) |
| Other means | – | 8 (0) | 11 (0) | 9 (0) | 12 (0) |
| Incorrect response | – | – | – | 27 (0) | – |
| Missing | 1226 (100) | 15 (0) | 41 (0) | 14 (0) | 47 (0) |
| FAS† | |||||
| Low | 405 (33) | 347 (31) | 975 (32) | 924 (32) | 952 (32) |
| Medium | 397 (32) | 359 (33) | 974 (32) | 926 (32) | 980 (33) |
| High | 434 (35) | 398 (36) | 1056 (35) | 1036 (36) | 1031 (35) |
Number and percentage in brackets.
*Community-level deprivation categories were derived from the population-weighted mean Scottish Index of Multiple Deprivation score for all census data zones (500–1000 residents) located within the school catchment areas, and the proportion of children from each school receiving free school meals.
†FAS raw scores were transformed though categorical principal component analysis into single-dimensional scores that were then divided into tertiles of low, medium and high affluence.
FAS, Family Affluence Score.