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. 2014 Sep 20;17(9):649–655. doi: 10.3779/j.issn.1009-3419.2014.09.02

2.

Comparison of baseline characteristics between those with missing and people with complete data on sleep duration

Variables Availability of data on sleep duration P value
No (n=7, 133) Yes (n=21, 026)
Age (mean±SD) 70.4±9.3 68.3±8.8 ﹤0.000, 1
Body mass index (mean±SD) 25.3±3.8 25.9±3.5 ﹤0.000, 1
Race (% White) 3, 945 (89.7) 19, 098 (91.3) 0.001
Smoking (%) ﹤0.000, 1
  Never 2, 053 (46.6) 11, 638 (55.4)
  Past 2, 150 (48.7) 8, 777 (41.8)
  Current 207 (4.7) 578 (2.8)
Exercise frequency (%) ﹤0.000, 1
  Rarely/never 1, 880 (44.2) 7, 272 (34.9)
  1-3/mo 102 (2.4) 504 (2.4)
  1-4/wk 1, 568 (36.9) 9, 282 (44.6)
  5-7/wk 702 (16.5) 3, 767 (18.1)
Alcohol consumption (drinks/wk) (%) ﹤0.000, 1
  ﹤1/wk 1, 450 (34.4) 6, 235 (29.8)
  1-4/wk 1, 101 (26.1) 5, 784 (27.6)
  5-7/wk 935 (22.1) 4, 968 (23.7)
   > 7/wk 732 (17.4) 3, 947 (18.9)
History of snoring (%) ﹤0.000, 1
  Rarely/never 84 (1.2) 4, 110 (19.5)
  Few/occasionally 173 (2.4) 8, 319 (39.6)
  Mostly/always 143 (2.0) 6, 799 (32.3)
  Unknown/missing 6, 733 (94.4) 1, 798 (8.6)
Sleep apnea (%) 85 (5.8) 895 (4.3 0.007
Prevalent diabetes (%) 784(11.0) 1, 821 (8.7) ﹤0.000, 1
Parental history of cancer (%) 1, 019 (51.36) 10, 086 (53.84) 0.036
Calories (median, IQR) 1, 588 (1, 261-1, 908) 1, 616 (1, 312-1, 987) ﹤0.000, 1