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Table 2 Comparison of baseline variables (S.D) of drop-outs vs. completers

From: Drop-out and mood improvement: a randomised controlled trial with light exposure and physical exercise [ISRCTN36478292]

        Analysis of variance    
Variable      Treatment group   Dropout group   Interaction  
  All Exercise&Light Exercise Light F p F p F p
Age      .50 .61 2.33 .13 2.20 .12
Drop-outs 39.5 (8.2) 41.3 (7.2) 35.4 (7.2) 43.4 (9.6)       
Completers 43.4 (9.6) 41.8 (9.2) 45.5 (10.2) 43.2 (9.3)       
GSS      1.35 .26 5.40 .02 .98 .38
Drop-outs 13.1 (4.5) 13.0 (5.0) 11.1 (3.3) 15.8 (4.5)       
Completers 10.5 (4.9) 10.1 (5.2) 10.5 (4.6) 10.9 (5.1)       
HDRS      4.38 .02 4.00 .05 1.55 .22
Drop-outs 13.6 (8.4) 16.3 (10.9) 8.29 (3.9) 16.6 (5.6)       
Completers 10.5 (6.4) 10.8 (7.0) 9.00 (5.2) 11.4 (6.6)       
ATYP*      1.18 .31 2.42 .12 .23 .79
Drop-outs 7.45 (5.3) 7.50 (5.4) 6.14 (5.0) 9.20 (6.0)       
Completers 5.92 (4.3) 6.22 (4.9) 5.07 (3.7) 6.32 (4.2)       
BMI**      .30 .74 1.88 .17 1.33 .27
Drop-outs 25.5 (4.9) 27.0 (6.2) 24.9 (4.5) 24.4 (3.8)       
Completers 24.2 (3.7) 23.6 (3.1) 24.1 (3.6) 24.7 (4.3)       
Sessions attended (%)      2.70 .07 143 .000 2.29 .11
Drop-outs 32.5 (24.4) 25.8 (20.6) 30.6 (24.9) 48.0(27.2)       
Completers 82.1 (14.4) 82.7 (14.4) 80.5 (15.2) 82.9(14.1)       
Fitness      2.61 .11 11.1 .001 7.82 .007
Drop-outs 93.3 (14.3) 83.7 (11.3) 99.1 (13.0) ----       
Completers 103.2 (12.1) 105.1 (13.6) 101.0 (10.2) ---       
BNSQ           
Initial insomnia      3.00 .06 6.00 .02 5.43 .006
Drop-outs 2.61 (1.2) 3.50 (.84) 2.14 (1.1) 2.20 (1.3)       
Completers 2.06 (.93) 1.84 (.81) 1.83 (.93) 2.43 (.93)       
Middle insomnia      1.91 .15 .23 .64 1.34 .27
Drop-outs 3.21 (1.4) 3.57 (1.4) 2.43 (1.1) 3.80 (1.6)       
Completers 3.11 (1.3) 3.10 (1.3) 3.03 (1.3) 3.19 (1.4)       
Late insomnia      2.97 .06 .55 .46 1.15 .32
Drop-outs 1.68 (.95) 1.86 (1.1) 1.14 (.38) 2.20 (1.1)       
Completers 1.92 (.92) 1.78 (.83) 1.79 (.90) 2.14 (.98)       
Quality of sleep      1.615 .20 .10 .753 .70 .50
Drop-outs 2.47 (1.1) 2.86 (1.2) 2.00 (0.0) 2.60 (1.3)       
Completers 2.42 (1.1) 2.34 (1.0) 2.21 (1.0) 2.65 (1.2)       
Alcohol consumption      .079 .92 .31 .58 .098 .91
Drop-outs 6.05 (5.6) 5.63 (6.3) 6.57 (6.7) 6.00 (3.4)       
Completers 5.34 (5.5) 5.00 (4.4) 4.97 (5.9) 5.92 (6.0)       
  1. *ATYP – atypical symptom score ** BMI – Body Mass Index Alcohol consumption – drinks per week