Table 3.
Difference in predicted mean sleep time (Diff MST, hours) compared with reference groups by gender and weekday versus weekend day.
| Weekday (M–F)a |
Weekend day (Sa–Su)a |
Weekday (M–F)a |
Weekend day (Sa–Su)a |
|||||
|---|---|---|---|---|---|---|---|---|
| Diff MST | 95% CI | Diff MST | 95% CI | Diff MST | 95% CI | Diff MST | 95% CI | |
| Intercept (Hours sleeping, Ref) | 7.57b | (7.42, 7.72) | 8.19b | (7.93, 8.46) | 7.83b | (7.72, 7.94) | 8.23b | (8.01, 8.44) |
| Diary Group (Ref: single job holders) | b | b | b | – | ||||
| MJH: Worked at both primary & other jobs | −0.37b | (−0.51, −0.23) | −0.64b | (−0.97, −0.30) | −0.12 | (−0.26, 0.02) | −0.09 | (−0.45, 0.26) |
| MJH: Worked only at other job | 0.12 | (−0.29, 0.54) | 0.24 | (−0.02, 0.49) | 0.33 | (−0.09, 0.75) | 0.002 | (−0.22, 0.23) |
| MJH: Worked only at primary job | −0.25b | (−0.43, −0.07) | −0.35b | (−0.59, −0.11) | −0.17b | (−0.31, −0.03) | −0.20 | (−0.41, 0.02) |
| Time of Day Working | ||||||||
| First reported work time (Ref: 0500–1059) | b | b | b | b | ||||
| 1100–1459 | 0.44b | (0.25, 0.64) | 0.82b | (0.64, 1.00) | 0.34b | (0.18, 0.50) | 0.81b | (0.63, 0.98) |
| 1500–0459 | −0.16b | (−0.30, −0.03) | 0.21b | (0.04, 0.39) | 0.27b | (0.10, 0.44) | 0.39b | (0.22, 0.57) |
| Any Work on Diary Day between 2200 and 0300 (Ref: No) | ||||||||
| Yes | −0.20b | (−0.33, −0.08) | −0.14 | (−0.32, 0.04) | −0.51b | (−0.64, −0.37) | −0.51b | (−0.69, −0.33) |
| Reciprocals of Sleep | ||||||||
| Work hours primary + secondary jobsc | −0.18b | (−0.20, −0.17) | −0.18b | (−0.20, −0.16) | −0.14b | (−0.15, −0.12) | −0.17b | (−0.19, −0.14) |
| Travel for work on diary day | −0.20b | (−0.24, −0.16) | −0.10b | (−0.18, −0.03) | −0.15b | (−0.21, −0.10) | −0.02b | (−0.15, 0.11) |
| Demographic | ||||||||
| Agec | −0.005b | (−0.009, −0.002) | −0.009b | (−0.014, −0.003) | −0.013b | (−0.016, −0.010) | −0.016b | (−0.021, −0.010) |
| Occupation Group (Ref: Professional & Related) | – | – | – | b | ||||
| Transport & material moving | 0.13 | (−0.05, 0.32) | 0.03 | (−0.31, 0.37) | −0.10 | (−0.44, 0.23) | 0.36 | (−0.20, 0.92) |
| Management, business and financial | 0.04 | (−0.07, 0.15) | −0.21 | (−0.42, 0.00) | −0.09 | (−0.19, 0.002) | −0.03 | (−0.24, 0.18) |
| Production occupations | −0.06 | (−0.23, 0.10) | −0.13 | (−0.49, 0.22) | 0.06 | (−0.13, 0.26) | 0.02 | (−0.47, 0.52) |
| Service occupations | 0.20b | (0.03, 0.37) | 0.01 | (−0.29, 0.31) | 0.05 | (−0.07, 0.17) | 0.01 | (−0.20, 0.22) |
| Sales and related | 0.11 | (–0.05, 0.27) | 0.06 | (−0.22, 0.35) | 0.07 | (−0.07, 0.21) | 0.03 | (−0.25, 0.30) |
| Office & admin support | 0.03 | (−0.13, 0.19) | −0.38b | (−0.73, −0.03) | −0.02 | (−0.12, 0.07) | −0.09 | (−0.36, 0.18) |
| Farm, fish, & forestry | 0.16 | (−0.26, 0.59) | 0.34 | (−0.28, 0.96) | 0.09 | (−0.40, 0.57) | 0.58b | (0.01, 1.15) |
| Construction & extraction | 0.003 | (−0.19, 0.19) | 0.05 | (−0.34, 0.44) | 0.23 | (−0.26, 0.71) | 0.37 | (−0.87, 1.61) |
| Install, maintenance, & repair | 0.03 | (−0.12, 0.19) | 0.07 | (−0.27, 0.41) | −0.27 | (−0.69, 0.16) | 1.64b | (1.09, 2.19) |
| Industry Group (Ref: Educ. and Health Services) | b | b | b | b | ||||
| Agriculture, forestry, fishing and hunting | 0.14 | (−0.13, 0.41) | 0.45b | (0.01, 0.88) | −0.27 | (−0.55, 0.02) | −0.35 | (−0.82, 0.12) |
| Mining | 0.18 | (−0.23, 0.58) | −0.84 | (−1.71, 0.03) | −0.20 | (−0.76, 0.37) | 1.84 | (−0.02, 3.69) |
| Construction | 0.10 | (−0.08, 0.29) | −0.01 | (−0.38, 0.36) | 0.02 | (−0.24, 0.28) | −0.50 | (−1.13, 0.13) |
| Manufacturing | 0.002 | (−0.14, 0.14) | −0.001 | (−0.30, 0.30) | −0.07 | (−0.21, 0.06) | 0.10 | (−0.27, 0.47) |
| Wholesale and retail trade | 0.09 | (−0.08, 0.26) | 0.19 | (−0.12, 0.50) | 0.15b | (0.02, 0.28) | 0.03 | (−0.24, 0.31) |
| Transportation and utilities | −0.10 | (−0.29, 0.09) | 0.16 | (−0.18, 0.50) | 0.02 | (−0.27, 0.30) | −0.43b | (−0.84, −0.03) |
| Information | 0.04 | (−0.15, 0.23) | 0.14 | (−0.30, 0.58) | 0.03 | (−0.17, 0.24) | −0.54 | (−1.17, 0.08) |
| Financial activities | 0.08 | (−0.10, 0.25) | 0.04 | (−0.31, 0.38) | 0.10 | (−0.01, 0.21) | −0.23 | (−0.50, 0.04) |
| Professional and business services | 0.06 | (−0.09, 0.21) | 0.22 | (−0.05, 0.48) | 0.08 | (−0.04, 0.19) | 0.06 | (−0.19, 0.30) |
| Leisure and hospitality | 0.27b | (0.05, 0.48) | 0.60b | (0.24, 0.97) | 0.25b | (0.09, 0.40) | 0.24 | (0.000, 0.48) |
| Other services | 0.19 | (0.01, 0.36) | 0.12 | (−0.21, 0.45) | 0.18b | (0.03, 0.33) | −0.01 | (−0.27, 0.26) |
| Public administration | −0.16 | (−0.34, 0.01) | −0.29 | (−0.63, 0.05) | 0.02 | (−0.10, 0.14) | −0.19 | (−0.59, 0.21) |
| Education (Ref: Some College or Associate Degree) | b | – | b | – | ||||
| Bachelor degree or higher | 0.07 | (−0.03, 0.16) | −0.12 | (−0.30, 0.05) | 0.01 | (−0.07, 0.10) | −0.07 | (−0.24, 0.10) |
| High school graduate or less | 0.26b | (0.17, 0.35) | 0.07 | (−0.10, 0.25) | 0.17b | (0.09, 0.26) | 0.08 | (−0.09, 0.25) |
| Other Fixed Factors | ||||||||
| Presence of child (<18) in household (Ref.: no) | −0.02 | (−0.10, 0.06) | −0.27b | (−0.42, −0.12) | −0.19b | (−0.26, −0.12) | −0.12 | (−0.26, 0.02) |
| Spouse or partner household (Ref.: yes) | 0.10b | (0.01, 0.19) | 0.07 | (−0.10, 0.23) | −0.01 | (−0.07, 0.06) | 0.25b | (0.12, 0.38) |
a M–F: Monday through Friday; Sa–Su: Saturday and Sunday.
b Regression coefficient significant, difference in mean sleep time between work group and reference group significant (p < 0.05).
c Difference in hours from mean in reference group include: mean hours/day working: male (Weekday = 8.4, Weekend day = 5.8); female (Weekday = 7.5, Weekend day = 5.2); mean age: male (Weekend day = 41,Weekday = 41), female (Weekend day = 40, Weekday = 41).