Table 1.

Characteristics of the male participants in the AGES-Reykjavik cohort by sleep disruption (four sleep questions), Iceland, 2002–2009

CategoryCharacteristicTotal (N = 2,102) No. (%) or mean (SD)Problem Falling Asleepa No. (%) or mean (SD)Problem Staying Asleepa No. (%) or mean (SD)Problem Falling and Staying Asleepa No. (%) or mean (SD)Severe Sleep Problema No. (%) or mean (SD)Very Severe Sleep Problema No. (%) or mean (SD)No Sleep Problemb (n = 755) No. (%) or mean (SD)
Prevalence of sleep problem 662 (31.5)273 (13.0)430 (20.5)352 (16.7)183 (8.7)120 (5.7)0
Number of cases 135273429211649
Agec, years 76.4 (5.3)77.3 (5.1)76.8 (5.3)76.9 (5.4)77.0 (5.0)77.2 (5.1)76.0 (5.2)
EducationElementary339 (16.5)44 (16.6)70 (16.9)60 (17.4)29 (16.3)18 (15.7)125 (16.9)
 Secondary1091 (53.2)146 (55.1)218 (52.5)191 (55.4)97 (54.5)59 (51.3)391 (52.8)
 College255 (12.4)33 (12.5)47 (11.3)36 (10.4)21 (11.8)15 (13.0)101 (13.6)
 University367 (17.9)42 (15.8)80 (19.3)58 (16.8)31 (17.4)23 (20.0)123 (16.6)
Family history of prostate cancer 194 (9.2)25 (9.2)33 (7.7)33 (9.4)16 (8.7)6 (5.0)70 (9.3)
Visit to doctor in previous 12 months 1714 (81.7)237 (86.8)375 (87.2)302 (85.8)159 (86.9)105 (87.5)569 (75.4)
Diagnosed as diabetic 365 (15.7)57 (20.9)76 (17.7)68 (19.3)39 (21.3)21 (17.5)115 (15.2)
Smoking statusNever581 (28.2)61 (23.0)108 (26.0)84 (24.3)40 (22.5)33 (28.7)239 (32.3)
 Previously1234 (60.0)177 (66.8)268 (64.4)218 (63.2)121 (68.0)75 (65.2)428 (57.8)
 Current242 (11.8)27 (10.2)40 (9.6)43 (12.5)17 (9.6)7 (6.1)74 (10.0)
Benign prostate disease 723 (34.4)116 (42.5)157 (36.5)133 (37.8)77 (42.1)47 (39.2)231 (30.6)
Alcoholc, g/week 22.4 (42.7)24.2 (45.8)24.3 (44.7)24.7 (48.6)26.5 (51.3)29.4 (56.6)20.8 (42.6)
Body mass indexc, m/kg2 26.9 (3.8)27.0 (3.8)26.8 (3.8)27.0 (3.8)27.0 (3.6)26.8 (3.6)27.0 (3.9)
  • aLess than once per week up to 6 times per week.

  • bNever or almost never.

  • cMean (Standard deviation).