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Table 5 Non-wear time (daily minutes) and sedentary time (% of total time accepted, daily minutes) in the different non-wear criteria for weight status and age groups, n = 1087 (Initial N = 1296)

From: Accelerometer data reduction in adolescents: effects on sample retention and bias

  Non-wear time Sedentary time
Weight status Age group Weight status Age group
  Under-/normal weight Over-weight Diff (%) p-value 11-12 years 13-14 years Diff (%) p-value Under-/normal weight Over-weight p-value 11-12 years 13-14 years p-value
90 min non-wear 15 16 1 (6.7) 0.551 14 17 3 (21.4) 0.131 59% (484 of 812) 62% (503 of 815) 0.001 59% (481 of 811) 62% (502 of 816) <0.001
60 min non-wear 18 20 2 (11.1) 0.527 18 21 3 (16.7) 0.115 59% (478 of 809) 61% (497 of 812) 0.002 59% (475 of 808) 61% (497 of 812) <0.001
30 min non-wear 27 29 2 (7.4) 0.364 26 31 5 (19.2) 0.010 58% (469 of 801) 61% (486 of 804) 0.005 58% (466 of 800) 61% (486 of 803) <0.001
20 min non-wear 35 40 5 (14.3) 0.049 34 40 6 (17.6) <0.001 58% (462 of 795) 60% (476 of 795) 0.006 58% (459 of 794) 60% (477 of 794) <0.001
10 min non-wear 55 65 10 (18.2) <0.001 54 64 10 (18.5) <0.001 57% (442 of 778) 59% (451 of 773) 0.016 57% (439 of 778) 59% (453 of 774) <0.001
  Overall significant interaction (p < 0.01) Overall significant interaction (p < 0.01) Overall non-significant interaction (p > 0.05) Overall non-significant interaction (p > 0.05)
  1. Daytime activity included (defined as the period from 6 am to 10 pm). Sedentary time analyses: Proportion of sedentary time out of total time accepted in each of the non-wear settings. Number of valid days and daily wear time were fixed to at least 5 days of 10 hours. Results are based on a multilevel mixed effect linear regression model with interaction terms.