| Outcome | All respondents | Full-time, 12 hour shifts | Full-time, non-12 hour shifts | Part-time, all shifts | Test for differences (p-value) | ||||||
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| Overall (comparing all 3 groups) | Comparing FT-12 hr vs. FT non-12 hr shift | Comparing FT vs. PT |
| Continuous Measures | n | Mean (SD) | n | Mean (SD) | n | Mean (SD) | n | Mean (SD) |
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| Birth weight | 120 | 3432.6 (599.2) | 56 | 3328.3 (577.7) | 27 | 3284.6 (602.4) | 33 | 3687.2 (516.6) | 0.015 | 0.763 | 0.004 |
| Gestational age | 120 | 38.7 (1.94) | 56 | 38.7 (1.83) | 27 | 38.3 (2.33) | 33 | 39.3 (1.53) | 0.178 | 0.474 | 0.063 |
| Categorized Measures | n | % | n | % of work category | n | % of work category | n | % of work category |
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| Birth weight |
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| 0.254 | 0.360 | 0.137 |
| <2500 | 9 | 7.8 | 6 | 10.7 | 3 | 11.1 | 0 | 0.0 |
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| 2500 to 3000 | 12 | 10.3 | 7 | 12.5 | 2 | 7.4 | 3 | 9.1 |
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| >3000 | 95 | 81.9 | 43 | 76.8 | 22 | 81.5 | 30 | 90.9 |
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| Preterm delivery |
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| 0.300 | 0.703 | 0.138 |
| Yes | 15 | 12.9 | 7 | 12.5 | 6 | 22.2 | 2 | 6.1 |
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| No | 101 | 87.1 | 49 | 87.5 | 21 | 77.8 | 31 | 93.9 |
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