Risk factors for repeat terminations compared to one termination
| Characteristic | AOR | 95% CI | P-value |
|---|---|---|---|
| Age (years) | |||
| <20 | 5.59 | (4.17–7.49) | ≤0.01 |
| 20–24 | 1.54 | (1.16–2.05) | ≤0.01 |
| 25–29 | 0.79 | (0.59–1.06) | 0.12 |
| 30–34 | 1.00 | (0.75–1.33) | 1.00 |
| 35–40 | 1.13 | (0.84–1.52) | 0.41 |
| >40 | 1 | ||
| Pregnancy number | |||
| 1 | 1 | ||
| 2 | 0.92 | (0.76–1.12) | 0.42 |
| ≥3 | 0.82 | (0.61–1.10) | 0.18 |
| Live birth | |||
| 0 | 1 | ||
| 1 | 1.21 | (0.98–1.51) | 0.08 |
| 2 | 1.51 | (1.12–2.02) | 0.01 |
| ≥3 | 1.33 | (0.96–1.85) | 0.08 |
| SIMD quintile | |||
| 1 (least deprived) | 1 | ||
| 2 | 1.04 | (0.88–1.24) | 0.62 |
| 3 | 1.15 | (0.97–1.37) | 0.10 |
| 4 | 1.17 | (0.99–1.37) | 0.06 |
| 5 (most deprived) | 1.23 | (1.05–1.43) | 0.01 |
| Previous miscarriage | |||
| 0 | 1 | ||
| 1 | 1.20 | (1.00–1.45) | 0.05 |
| ≥2 | 1.40 | (1.02–1.92) | 0.04 |
| Ectopic | |||
| 0 | 1 | ||
| ≥1 | 1.00 | (0.58–1.72) | 1.00 |
| Trimester | |||
| 1 | 1 | ||
| 2 | 0.90 | (0.77–1.05) | 0.17 |
| Chlamydia | |||
| Negative/not tested | 1 | ||
| Positive | 0.98 | (0.83–1.16) | 0.83 |
| STI BBV test* | |||
| Negative/not tested | 1 | ||
| Tested | 1.65 | (1.40–1.95) | ≤0.01 |
| Method | |||
| MTOP | 1 | ||
| STOP | 0.85 | (0.77–0.94) | ≤0.01 |
| Contraception at the time of conception | |||
| None/unknown/natural | 1 | ||
| Barrier | 0.95 | (0.85–1.05) | 0.28 |
| Depo-Provera® | 0.94 | (0.39–2.28) | 0.89 |
| Hormonal | 1.06 | (0.93–1.20) | 0.39 |
| LARC | 1.36 | (0.74–2.49) | 0.32 |
| Other | 1.54 | (0.90–2.62) | 0.11 |
| Contraception administered after termination | |||
| None/unknown/natural | 1 | ||
| Barrier | 0.82 | (0.64–1.06) | 0.13 |
| Depo-Provera | 0.88 | (0.73–1.06) | 0.18 |
| Hormonal | 1.05 | (0.91–1.22) | 0.52 |
| Implant | 1.78 | (1.50–2.11) | ≤0.01 |
| IUS/IUD | 1.17 | (0.95–1.44) | 0.13 |
| Other | 1.35 | (0.85–2.15) | 0.20 |
*STI, BBV and syphilis.
Statistically significant values are in bold.
AOR, adjusted odds ratio; BBV, blood borne virus; CI, confidence interval; IUD, intrauterine device; IUS, intrauterine system; LARC, long-acting reversible contraception; MTOP, medical termination of pregnancy; SIMD, Scottish Index of Multiple Deprivation; STI, sexually transmitted infection; STOP, surgical termination of pregnancy.