Table S1.
Reported light and photopic illumination for day- and nightshift workers (TA10)
| After turning off the light/when you woke up for the day, was there any light still visible in your room? | ||||||||
|---|---|---|---|---|---|---|---|---|
| BT responses | WT responses | |||||||
| Yes | No | P-value (n) | Yes | No | P-value (n) | |||
| Day | 1.73±1.83 (62) | 0.45±2.30 (28) | (90) | 1.87±2.56 (63) | 1.44±3.09 (25) | (88) | ||
| Night | 4.76±1.72 (67) | 0±2.23 (26) | (93) | 6.47±2.36 (87) | 1.77±4.69 (6) | (93) | ||
| Both | 3.24±1.26 (129) | 0±1.60 (54) | 0.05 (183) | 4.17±1.74 (150) | 1.61±2.81 (31) | 0.31 (181) | ||
| If you answered “yes”, would you describe the light source as artificial (eg, lamp or ceiling fixture), natural (eg, sun, stars, or moon), or both? | ||||||||
| Artificial | Natural | Both | Artificial | Natural | Both | |||
| Day | 4.77±3.25 (35) | 1.69±4.54 (18) | 0±5.69 (8) | (61) | 0.36±3.67 (15) | 2.76±3.22 (32) | 2.20±3.96 (16) | (63) |
| Night | 5.41±4.22 (7) | 5.11±3.04 (37) | 4.07±3.71 (23) | (67) | NA | 6.98±2.55 (68) | 4.18±4.22 (19) | (87) |
| Both | 5.09±2.66 (42) | 3.40±2.73 (55) | 0±3.40 (31) | 0.01* (128) | 0.36±3.67 (15) | 4.87±2.05 (100) | 3.19±2.89 (35) | 0.70 (150) |
| Were you able to see objects in your room? | ||||||||
| Yes | No | Yes | No | |||||
| Day | 1.56±1.75 (70) | 0.56±2.63 (20) | (90) | 1.79±2.50 (83) | 1.05±5.14 (6) | (89) | ||
| Night | 4.43±1.67 (68) | 0±2.26 (25) | (93) | 6.37±2.36 (89) | 1.37±5.50 (4) | (93) | ||
| Both | 3.00±1.21 (138) | 0.21±1.73 (45) | 0.10 (183) | 4.08±1.72 (172) | 1.21±3.76 (10) | 0.42 (182) | ||
| If you answered “yes”, did visible objects appear to be in shades of gray or in color (even if less vivid)? | ||||||||
| Color | Gray | Color | Gray | |||||
| Day | 1.58±2.65 (22) | 2.07±2.25 (44) | (66) | 2.33±2.62 (46) | 1.10±2.71 (37) | (83) | ||
| Night | 6.45±2.20 (33) | 2.40±2.20 (35) | (68) | 7.28±2.38 (73) | 2.17±3.84 (16) | (89) | ||
| Both | 4.01±1.72 (55) | 2.24±1.57 (79) | 0.38 (134) | 4.81±1.77 (119) | 1.63±2.35 (53) | 0.15 (172) | ||
Notes: Response frequencies, estimated marginal means, errors, and P-values for main effect of response type by type of shift (day/night) for minutes above 10 lux (TA10). Light questions and responses shown by column, organized by BT and WT. TALT was measured in the 1- and 2-hour intervals inside BT and WT. Values here are for the 1-hour interval. Values vary slightly here from those reported in Table 1, due to inclusion here of only day and night workers (no administrator) and of shift and its interaction with response in all models. All P-values are for main effects for response only.
P<0.05, response–shift interaction.
Abbreviations: BT, bedtime; WT, wake time; NA, not applicable; TALT, time above light threshold; TA10, TALT of 10 lux.