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Table 3 Distribution of selected SF-36 combined measures by group and time period.

From: The effect of high correlated colour temperature office lighting on employee wellbeing and work performance

   Baseline Study End (3 months) % change Unpaired ttest (df = 67) Paired ttest (df = 22) Paired ttest (df = 45) Unpaired ttest (df = 67)
Item No. Description Control (n = 23) Intervention (n = 46) Control (n = 23) Intervention (n = 46) Control Intervention Baseline comparison Control change Intervention change 3 month comparison
   mean (SD) mean (SD) mean (SD) mean (SD)    t statistic t statistic t statistic t statistic
GH General Health 65.5 (22.4) 67.8 (20.5) 70.3 (22.0) 73.8 (17.0) 7.4 8.7 -0.44 -1.57 -2.33 -0.25
V Vitality 43.2 (23.5) 48.4 (20.4) 50.5 (19.0) 62.1 (17.1) 17.0 28.4 -0.94 -1.95 -4.44** -1.25
SF Social Functioning 63.6 (27.7) 75.0 (25.4) 81.0 (19.5) 85.6 (17.7) 27.4 14.1 -1.71 -3.35* -3.09 1.11
RE Role Emotional 77.5 (29.1) 80.8 (23.8) 80.4 (27.9) 86.1 (19.5) 3.7 6.5 -0.50 -0.56 -1.53 -0.39
MH Mental Health 62.8 (22.2) 64.3 (20.5) 67.8 (16.8) 73.3 (15.8) 8.0 13.9 -0.28 -1.78 -3.42* -0.93
  1. * = p < 0.05, ** = p < 0.001 equivalent after applying Bonferroni correction
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