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Table 1 Characteristics of study participants

From: Association between difficulty initiating sleep in older adults and the combination of leisure-time physical activity and consumption of milk and milk products: a cross-sectional study

  All (n = 421) Non-DIS (n = 286) DIS (n = 135)
  Mean ± SD Mean ± SD Mean ± SD
Age, years 74.9 ± 5.5 74.7 ± 5.5 75.3 ± 5.6
Women, n (%) 237 (56.3) 149 (52.1) 88 (65.2)*
Height, cm 155.2 ± 9.0 156.0 ± 8.6 153.6 ± 9.5*
Weight, kg 56.1 ± 9.6 56.9 ± 9.7 54.4 ± 9.3*
Body mass index, kg/m2 23.2 ± 2.9 23.3 ± 2.9 23.0 ± 2.8
Total sleep time, min 405.9 ± 73.4 411.6 ± 70.8 393.7 ± 77.3*
Sleep latency, min 21.1 ± 21.5 10.7 ± 5.5 43.2 ± 25.8*
Hypnotic use, n (%) 80 (19.0) 34 (11.9) 46*
Leisure-time physical activity, points 21.7 ± 25.1 23.7 ± 26.9 17.6 ± 20.5*
Milk consumption    
Frequency, days/week 3.6 ± 2.9 3.8 ± 3.0 3.2 ± 2.9
Volume, ml/day 155.9 ± 127.1 162.9 ± 129.4 141.0 ± 121.1
Total consumption, ml/week 784.3 ± 813.4 819.0 ± 833.1 710.9 ± 767.7
Yogurt consumption    
Frequency, days/week 4.0 ± 2.8 3.9 ± 2.9 4.1 ± 2.8
Volume, g/day 104.6 ± 79.0 100.6 ± 72.2 113.4 ± 91.9
Total consumption, g/week 506.6 ± 491.4 469.9 ± 418.7 587.1 ± 616.0*
Cheese consumption    
Frequency, days/week 1.3 ± 1.8 1.3 ± 1.8 1.3 ± 2.0
Volume, g/day 14.3 ± 16.6 15.6 ± 17.3 11.5 ± 14.8*
Total consumption, g/week 35.6 ± 55.3 37.4 ± 56.6 31.9 ± 52.6
Total dairy consumption    
Frequency, days/week 5.4 ± 2.4 5.4 ± 2.4 5.3 ± 2.3
Volume, g/day 193.9 ± 149.4 194.2 ± 145.0 193.5 ± 159.0
Total consumption, g/week 1357.5 ± 1045.9 1359.1 ± 1015.0 1354.3 ± 1112.9
  1. *P < 0.05 (Non-DIS vs. DIS).
  2. DIS: difficulty initiating sleep (30 min  sleep latency).
  3. SD: standard deviation.