Table 4. Effect size of sleep duration on FT3 in prespecified and exploratory subgroups.
| Character | Total sleep duration | Categories sleep duration | ||||||
|---|---|---|---|---|---|---|---|---|
| 95% CI | p | p for interaction | <7 | 7–9 | >9 | p for trend | p for interaction | |
| Sex | 0.323 | 0.89 | ||||||
| Male | -0.014(-0.028,0.001) | 0.073 | reference | -0.053(-0.095,-0.011) | -0.067(-0.159, 0.026) | 0.01 | ||
| Female | -0.024(-0.038,-0.009) | 0.002 | reference | -0.058(-0.102,-0.013) | -0.102(-0.210, 0.006) | 0.008 | ||
| AGE (years) | 0.739 | 0.174 | ||||||
| >50 | -0.019(-0.030,-0.008) | 0.001 | reference | -0.038(-0.067,-0.008) | -0.146(-0.234,-0.059) | <0.001 | ||
| <50 | -0.016(-0.030,-0.002) | 0.029 | reference | -0.059(-0.104,-0.014) | -0.057(-0.153, 0.039) | 0.013 | ||
| Race/Ethnicity | 0.087 | 0.243 | ||||||
| White | -0.031(-0.048,-0.014) | <0.001 | reference | -0.081(-0.128,-0.034) | -0.13(-0.238,-0.023) | <0.001 | ||
| Black | -0.012(-0.041,0.018) | 0.435 | reference | -0.015(-0.079, 0.050) | -0.239(-0.376,-0.103) | 0.257 | ||
| Mexican | 0.01(-0.027,0.048) | 0.573 | reference | -0.008(-0.175,0.159) | 0.091(-0.196,0.379) | 0.956 | ||
| Other | -0.012(-0.029,0.005) | 0.164 | reference | -0.04(-0.103,0.022) | -0.084(-0.183,0.015) | 0.126 | ||
| Ever told doctor had trouble sleeping? | 0.536 | 0.889 | ||||||
| No | -0.024(-0.039,-0.008) | 0.003 | reference | -0.074(-0.119,-0.030) | -0.117(-0.204,-0.030) | <0.001 | ||
| Yes | -0.033(-0.057,-0.009) | 0.008 | reference | -0.067(-0.125,-0.010) | -0.14(-0.246,-0.033) | 0.016 | ||
| Ever told by doctor have sleep disorder? | 0.194 | 0.918 | ||||||
| No | -0.019(-0.031,-0.006) | 0.004 | reference | -0.062(-0.099,-0.024) | -0.104(-0.180,-0.028) | <0.001 | ||
| Yes | -0.045(-0.083,-0.007) | 0.020 | reference | -0.078(-0.182,0.026) | -0.105(-0.340,0.129) | 0.116 | ||
| Smoke | 0.408 | 0.178 | ||||||
| Never | -0.027(-0.043,-0.012) | <0.001 | reference | -0.078(-0.134,-0.021) | -0.157(-0.248,-0.065) | 0.003 | ||
| Former | -0.021(-0.039,-0.003) | 0.026 | reference | -0.026(-0.070, 0.018) | -0.187(-0.308,-0.065) | 0.077 | ||
| Now | -0.012(-0.036,0.012) | 0.318 | reference | -0.054(-0.125,0.017) | 0.013(-0.100,0.126) | 0.187 | ||
| Alcohol. User | 0.096 | 0.26 | ||||||
| Never | -0.009(-0.027,0.009) | 0.324 | reference | -0.031(-0.106,0.044) | -0.071(-0.220,0.078) | 0.3 | ||
| Former | -0.035(-0.062,-0.009) | 0.010 | reference | -0.088(-0.190, 0.013) | -0.143(-0.283,-0.004) | 0.055 | ||
| Mild | -0.037(-0.052,-0.022) | <0.0001 | reference | -0.093(-0.129,-0.057) | -0.157(-0.306,-0.008) | <0.0001 | ||
| Moderate | -0.012(-0.033,0.009) | 0.252 | reference | -0.024(-0.073,0.026) | -0.205(-0.469,0.058) | 0.212 | ||
| Heavy | -0.003(-0.033,0.027) | 0.842 | reference | -0.001(-0.094,0.093) | -0.083(-0.280,0.113) | 0.857 | ||
| BMI (kg/m2) | 0.013 | 0.069 | ||||||
| <25 | -0.01(-0.030,0.010) | 0.336 | reference | -0.063(-0.126,0.001) | -0.067(-0.179,0.046) | 0.042 | ||
| 25–29.9 | -0.041(-0.059,-0.023) | <0.0001 | reference | -0.104(-0.164,-0.045) | -0.136(-0.266,-0.006) | <0.001 | ||
| ≥30 | -0.013(-0.029,0.003) | 0.119 | reference | -0.013(-0.068, 0.041) | -0.135(-0.260,-0.011) | 0.369 | ||
| UIC (ug/dL) | 0.285 | 0.189 | ||||||
| <100 | -0.019(-0.041,0.002) | 0.078 | reference | -0.046(-0.097,0.005) | -0.078(-0.203,0.048) | 0.071 | ||
| 100–299 | -0.014(-0.028,-0.001) | 0.032 | reference | -0.05(-0.098,-0.003) | -0.073(-0.191, 0.045) | 0.028 | ||
| ≥300 | -0.036(-0.060,-0.012) | 0.004 | reference | -0.122(-0.195,-0.048) | -0.141(-0.259,-0.022) | 0.001 | ||
| PIR | 0.016 | 0.018 | ||||||
| <1 | 0.002(-0.015,0.020) | 0.809 | reference | 0.014(-0.043,0.070) | 0.025(-0.132,0.181) | 0.598 | ||
| 1–3.9 | -0.025(-0.041,-0.009) | 0.003 | reference | -0.06(-0.109,-0.011) | -0.175(-0.265,-0.084) | 0.003 | ||
| ≥4 | -0.035(-0.056,-0.014) | 0.002 | reference | -0.092(-0.146,-0.037) | -0.086(-0.234, 0.061) | <0.001 | ||
| Marital | 0.068 | 0.171 | ||||||
| Married, or living with partner | -0.026(-0.039,-0.013) | <0.001 | reference | -0.074(-0.118,-0.031) | -0.055(-0.126, 0.016) | 0.001 | ||
| Widowed, divorced, or separated | -0.039(-0.063,-0.015) | 0.002 | reference | -0.08(-0.142,-0.018) | -0.265(-0.373,-0.158) | 0.001 | ||
| Never married | -0.004(-0.025,0.018) | 0.725 | reference | -0.032(-0.103,0.040) | -0.092(-0.233,0.050) | 0.267 | ||
Each stratification adjusted for all factors (sex, age, race/ethnicity, marital status, BMI, sleep disturbance, poverty income ratio, smoking status, alcohol consumption status, UIC) except the stratification factor itself.