Table 1 Descriptive group statistics.

From: Multimodal investigation of the association between shift work and the brain in a population-based sample of older adults

Variable

PRESENT (n = 13)/MATCHED controls (n = 13)

FORMER (n = 89)/MATCHED controls

NEVER (n = 430)

Age (years)

60.99 (SD = 2.27)/61.22 (SD = 3.90)

67.70 (SD = 6.40)/68.33 (SD = 6.49)

67.06 (SD = 6.49)

Sex

9 males, 4 females/9 males, 4 females

71 males, 18 females/74 males, 13 females

207 males, 223 females

Education

5.92 (SD = 1.89)/5.38 (SD = 0.77)

6.38 (SD = 1.96)/6.29 (SD = 1.90)

6.35 (SD = 1.94)

Smoking (Pack-years)

29.27 (SD = 23.88)/9.22 (SD = 14.29), p = 0.006

20.42 (SD = 30.71)/17.28 (SD = 21.48)

12.31 (SD = 18.78)

Alcohol consumption

96.57 (SD = 120.95)/68.77 (SD = 107.37)

86.82 (SD = 108.15)/85.65 (SD = 172.68)

70.21 (SD = 130.77)

Coffee Consumption

4.50 (SD = 1.00)/4.69 (SD = 0.86)

4.46 (SD = 1.21)/4.48 (SD = 1.19)

4.55 (SD = 1.08)

Black Tea consumption

2.25 (SD = 1.36)/1.77 (SD = 0.93)

2.10 (SD = 1.34)/1.93 (SD = 1.28)

2.10 (SD = 1.43)

Shift work years

19.77 (SD = 12.11)/0

10.07 (SD = 10.06)/0

0

  1. Group statistics are given in unadjusted means (Standard deviation) for purposes of interpretability. Alcohol consumption was measured in grams of pure alcohol per week. For the ordinally scaled variables of coffee and black tea consumption the following scale was used: 1.00 = Almost never, 2 = 1–3 times per month, 3 = 1–3 times a week, 4 = 4–6 times a week; 5 = daily.
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