Table 2. Sleep after delivery, according to parity among 2088 women.
| Sleep variable | Primipara | Multipara | Mean difference | 95% CI | p-value |
| n = 1058 | n = 1026 | ||||
| mean (SD) | mean (SD) | t-test | |||
| Sleep duration (h:mm) | 6:33 (1:24) | 6:26 (01.11) | −0:07 | −0:14; 0:00 | .031 |
| Sleep efficiency (%) | 73.1 (14.6) | 76.8 (12.8) | 3.77 | 2.57; 4.96 | <.001 |
| Time in bed (h:mm) | 9:07 (1:33) | 8:26 (1:13) | −0:40 | −0:47; −0:33 | <.001 |
| Time baby awake (h:mm) | 2:07 (1:12) | 1:41 (1:05) | −0:26 | −0:32; −0:20 | <.001 |
| mean (SD) | mean (SD) | ||||
| BIS, sum | 15.97 (9.1) | 14.94 (8.8) | −1.03 | −1.79; −.26 | <.001 |
| Sleep initiation | 1.74 (2.1) | 1.23 (1.9) | −.51 | −.67; −.32 | <.001 |
| Sleep maintenance | 4.55 (2.7) | 3.92 (2.8) | −.63 | −.87; −.40 | <.001 |
| Early awakening | 1.35 (2.1) | 1.22 (2.0) | −.13 | −.31; .04 | .13 |
| Non-restorative sleep | 3.64 (2.3) | 3.74 (2.3) | .10 | −.10; .29 | .34 |
| Daytime impairment | 1.74 (2.0) | 1.84 (2.0) | .10 | −.08; .27 | .27 |
| Satisfaction with sleep | 2.95 (2.3) | 3.00 (2.4) | .05 | −.15; .25 | .78 |
| n (%) | n (%) | Chi X2 | |||
| Insomnia DSM-IV | 567 (53.3%) | 556 (53.9%) | 0.6% | −3.4; 4.7 | .79 |
| Criterion A Nighttime | 916 (86.1%) | 866 (84.6%) | −1.5% | −4.4; 1.3 | .17 |
| Criterion B Daytime | 579 (54.6%) | 568 (55.1%) | 0.5% | −3.5; 4.6 | .79 |
BIS - Bergen Insomnia Scale - sub scores represent number of days per week with the insomnia symptom.
h:mm - hours:minutes.