Teun Remmers

92 | Chapter 6 Table 1: Distribution of physical activity and weather variables across the school terms Daily level ( n =4599 days of measurement) School Term 1 (summer) School Term 2 (autumn) School Term 3 (winter) School Term 4 (spring) Number of children included (% from total) 238 (77.5%) 212 (69.1%) 269 (87.6%) 272 (88.6%) Accelerometer weartime (daily minutes), mean (SD) 780.0 (212.3) * 807.0 (224.6) 1 4 826.3 (214.9) 1 814.7 (208.8) 1 Sedentary time (daily minutes), mean (SD) 467.1 (174.6) 2 3 492.2 (191.8) 1 4 492.8 (181.3) 1 4 473.8 (176.1) 3 Light physical activity (daily minutes), mean (SD) 253.2 (70.8) 4 249.5 (71.9) 3 4 258.2 (66.4) 2 4 267.7 (73.1) * Moderate physical activity (daily minutes), mean (SD) 43.7 (21.0) 3 4 45.9 (22.2) 3 4 50.8 (20.6) 1 2 51.8 (22.3) 1 2 Vigorous physical activity (daily minutes), mean (SD) 16.7 (14.4) * 19.5 (15.2) * 25.1 (18.4) * 21.4 (16.0) * Moderate physical activity (daily average in %), mean (SD) 5.8 (2.8) 3 4 5.9 (2.9) 3 4 6.4 (2.6) 1 2 6.5 (2.8) 1 2 Vigorous physical activity, (daily average in %), mean (SD) 2.2 (1.9) * 2.5 (2.1) 1 3 3.2 (2.5) * 2.7 (2.0) 1 3 Rainfall (number of days) (%) * * * * No rainfall 591 (60.5) 446 (50.8) 532 (36.4) 846 (66.0) 0.01 – 7.8 mm per day 218 (22.3) 217 (24.7) 514 (35.2) 136 (10.6) 7.9 – 46.0 mm per day 168 (17.2) 215 (24.5) 416 (28.5) 300 (23.4) Humidity (daily average in percentage), mean (SD) 60.0 (12.6) 2 3 71.2 (13.0) * 67.2 (10.6) * 61.0 (12.3) 2 3 Day length (total daily minutes), mean (SD) 761.8 (34.2) * 599 (20.3) * 651.3 (21.7) * 851.4 (18.7) * Temperature (daily maximum in °C), mean (SD) 27.5 (5.2) * 16.6 (2.8) * 15.2 (2.9) * 22.6 (5.3) * Solar Radiation exposure (daily total in MJ/m 2 ), mean (SD) 19.56 (7.23) * 6.99 (2.61) * 10.28 (3.61) * 21.74 (7.59) * Differences between school terms for continuous variables were tested using Bonferroni-corrected analyses of variance and for categorical variables using chi-square tests : * statistically significant difference between term in column and all other school terms, 1 statistically significant difference between term in column and school term 1 (summer), 2 statistically significant difference between term in column and school term 2 (autumn), 3 statistically significant difference between term in column and school term 3 (winter), 4 statistically significant difference between term in column and school term 4 (spring).