Incidence rate ratios (IRRs) for admissions during different time periods, by social deprivation, maternal age, parity and previous psychiatric admission
| Pre-pregnancy admissions N=853 | Pregnancy admissions N=315 | Early postpartum admissions N=277 | Late postpartum admissions N=1845 | |
|---|---|---|---|---|
| IRR (95%CI) | IRR (95%CI) | IRR (95%CI) | IRR (95%CI) | |
| Deprivation quintile | ||||
| Most deprived | 1 | 1 | 1 | 1 |
| 2 | 1.00 (0.87 to 1.15) | 0.88 (0.67 to 1.14) | 1.04 (0.84 to 1.26) | 1.03 (0.95 to 1.10) |
| 3 | 1.06 (0.91 to 1.23) | 0.67 (0.47 to 0.93) | 1.04 (0.83 to 1.21) | 0.92 (0.83 to 1.01) |
| 4 | 0.75 (0.61 to 0.91) | 0.63 (0.41 to 0.93) | 1.18 (0.92 to 1.51) | 1.13 (0.97 to 1.22) |
| Least deprived | 0.90 (0.69 to 1.15) | 0.94 (0.61 to 1.45) | 1.29 (1.02 to 1.59) | 0.87 (0.74 to 0.98) |
| Age group (years) | ||||
| Under 20 | 1 | 1 | 1 | 1 |
| 20–35 | 0.82 (0.69 to 0.97) | 0.83 (0.55 to 1.22) | 1.21 (0.89 to 1.63) | 1.35 (1.16 to 1.54) |
| 26–30 | 0.52 (0.42 to 0.62) | 0.90 (0.60 to 1.34) | 1.19 (0.86 to 1.62) | 1.51 (1.30 to 1.75) |
| 31–35 | 0.55 (0.44 to 0.66) | 0.80 (0.52 to 1.22) | 1.10 (0.79 to 1.53) | 1.42 (1.21 to 1.65) |
| 36–40 | 0.38 (0.29 to 0.49) | 1.10 (0.69 to 1.72) | 1.05 (0.72 to 1.53) | 1.45 (1.23 to 1.71) |
| Over 40 | 0.24 (0.12 to 0.43) | 0.59 (0.25 to 1.39) | 0.77 (0.46 to 1.53) | 1.72 (1.41 to 2.09) |
| Parity | ||||
| Primiparous | 0.77 (0.67 to 0.83) | 0.90 (0.71 to 1.14) | 1.35 (1.14 to 1.53) | 1.07 (1.01 to 1.14) |
| Previous inpatient care | ||||
| Yes | 1.23 (1.10 to 1.38) | 1.28 (1.03 to 1.60) | 0.86 (0.73 to 1.01) | 0.91 (0.86 to 0.97) |
Bold values indicate statistically significant at p<0.05 level.