Table 1

Description of sample by diabetes status

VariableNo diabetes (n = 531)Type 2 diabetes (n = 40)P
Mean (SD)RangeMean (SD)Ranget test
Age (years)45.2 (3.6)37–5245.6 (3.8)38–510.51
BMI (kg/m2)28.4 (6.5)17.2–61.037.9 (9.2)24.3–60.3<0.0001
Glucose (mmol/L)5.3 (0.5)3.5–6.88.2 (2.7)4.8–19.4<0.0001
Insulin (pmol/L)79.1 (50.7)4.5–504.8151.2 (88.3)46.2–493.1<0.0001
HOMA3.1 (2.2)0.2–21.99.1 (5.8)2.1–30.2<0.0001
Actual sleep (hours)6.1 (1.0)2.6–8.85.9 (1.3)2.3–7.70.18
Sleep fragmentation (%)19.0 (7.8)4.4–63.920.3 (8.7)6.5–41.80.29
Sample (%)Sample (%)χ2 test
Women57700.11
African Americans41600.018
Insomnia17350.005
Frequent snorers12230.06