Table 1.
Demographic characteristics
| Variables | Low acute postpartum pain (NRS 0–2) N = 759 |
High acute postpartum pain (NRS ≥ 3) N = 121 |
Unadjusted OR (95% CI) | P-value |
|---|---|---|---|---|
| Age (years), mean (SD) | 30.9 (4) | 30.9 (3.9) | 0.99 (0.95–1.04) | 0.8197 |
| Race, n (%) | 0.9576 a | |||
| Chinese | 402 (53.5) | 65 (55.1) | Reference | |
| Malay | 211 (28.1) | 31 (26.3) | 0.87 (0.38–1.99) | 0.7347 |
| Indian | 50 (6.6) | 7 (5.9) | 0.91 (0.57–1.44) | 0.6825 |
| Others | 89 (11.8) | 15 (12.7) | 1.04 (0.57–1.91) | 0.8934 |
| Marital status, n (%) | 0.3959 a | |||
| Married | 724 (96.8) | 117 (100) | Reference | -- |
| Single/ divorced/ separated | 24 (3.2) | 0 | 0.14 (0.01–2.42) | 0.1750 |
| Weight (kg), mean (SD) | 73.3 (13.3) | 74.1 (14.4) | 1.00 (0.99–1.02) | 0.6198 |
| BMI (kg/ m2), mean (SD) | 29.2 (9.6) | 28.5 (4.9) | 0.99 (0.94–1.03) | 0.5059 |
| Housing type, n (%) | ||||
| Public | 586 (89.3) | 97 (93.3) | Reference | -- |
| Private | 70 (10.7) | 7 (6.7) | 0.60 (0.27–1.35) | 0.2204 |
| Housing status, n (%) | ||||
| Owned | 519 (88.9) | 78 (81.3) | Reference | -- |
| Renting | 65 (11.1) | 18 (18.8) | 1.84 (1.04–3.27) | 0.0368 |
| Occupation, n (%) | 0.7568a | |||
|
Homemaker/ unemployed self-employed/ |
123 (17.0) | 16 (14.7) | Reference | -- |
| Professional/ management | 349 (48.3) | 52 (47.7) | 1.15 (0.63–2.08) | 0.6558 |
| Service/ sales/ others | 250 (34.6) | 41 (37.6) | 1.26 (0.68–2.34) | 0.4616 |
| Highest educational status, n (%) | ||||
| Post-secondary and below | 602 (85.3) | 99 (87.6) | Reference | -- |
| Post-graduate | 104 (14.7) | 14 (12.4) | 0.82 (0.45–1.49) | 0.5112 |
|
Personal history of psychiatric illness, n (%) b |
||||
| No | 704 (92.8) | 113 (93.4) | Reference | -- |
| Yes | 55 (7.2) | 8 (6.6) | 0.91 (0.42–1.95) | 0.8015 |
|
Family history of psychiatric illness, n (%) c |
||||
| No | 701 (92.4) | 108 (89.3) | Reference | -- |
| Yes | 58 (7.6) | 13 (10.7) | 1.45 (0.77–2.74) | 0.2470 |
P values are based on fisher’s exact test for categorical variable and two sample t-test or Mann-Whitney U - test for continuous variables. The missing data are as follows: race (n = 10), marital status (n = 15), housing type (n = 120), housing status (n = 200), occupation (n = 49), and highest education level (n = 61)
BMI body mass index; CI confidence interval; NRS numerical rating scale; OR odds ratio; SD standard deviation
a Type III p-value
b The subcategories of those with a personal history of psychiatric illness were: depression (n = 22), other mood disorders (n = 1), and others (n = 43)
c The subcategories of those with a family history of psychiatric illness were: depression (n = 20), bipolar (n = 7), other mood disorders (n = 2), and others (n = 45)