Table 5 Zero-inflated negative binomial regression model for prevalence of syphilis among pregnant women in southwest of China, 2009–2018
Variable | Positive cases (n, %) | Estimate | SE | z value | aOR (95% CI) |
|---|---|---|---|---|---|
Age | |||||
< 35 years | 159 (0.75%) | 1.00 | |||
≥ 35 years | 43 (1.54%) | 0.49 | 0.25 | 1.95 | 1.64 (1.00–2.70)* |
Ethnicity | |||||
Other minorities | 116 (0.78%) | 1.00 | |||
Han | 86 (0.96%) | 1.24 | 0.46 | 2.70 | 3.44 (1.40–8.42)** |
Marital status | |||||
Married/cohabitating | 186 (0.85%) | 1.00 | |||
Unmarried/widowed/divorced | 16 (0.82%) | − 0.12 | 0.36 | − 0.32 | 0.89 (0.44–1.81) |
Education level | |||||
≥ 9 years | 40 (0.60%) | 1.00 | |||
< 9 years | 162 (0.95%) | 0.43 | 0.25 | 1.70 | 1.53 (0.94–2.51) |
Awareness of HIV related knowledge | |||||
No | 18 (0.81%) | 1.00 | |||
Yes | 184 (0.85%) | − 0.06 | 0.29 | − 0.22 | 0.94 (0.53–1.67) |
Primigravidae | |||||
Yes | 47 (0.51%) | 1.00 | |||
No | 155 (1.06%) | 0.45 | 0.25 | 1.78 | 1.56 (0.96–2.55) |
Multiple sexual partners | |||||
No | 92 (0.74%) | 1.00 | |||
Yes | 85 (0.89%) | − 0.04 | 0.64 | − 0.07 | 0.96 (0.27–3.38) |
Parity | |||||
Nulliparous | 195 (0.84%) | 1.00 | |||
Parous | 5 (4.07%) | − 0.25 | 0.24 | − 1.03 | 0.78 (0.49–1.25) |
A history of STI | |||||
No | 177 (0.75%) | 1.00 | |||
Yes | 25 (18.38%) | 2.20 | 0.44 | 5.05 | 9.06 (3.85–21.30)** |
Husband's history of STI | |||||
No | 199 (0.85%) | 1.00 | |||
Yes | 3 (0.93%) | 1.26 | 0.66 | 1.91 | 3.53 (0.97–12.87) |
A history of drug use | |||||
No | 202 (0.85%) | ||||
Yes | 0 (0.0%)a | – | – | – | – |
Husband’s history of drug use | |||||
No | 200 (0.84%) | ||||
Yes | 1 (1.01%)b | – | – | – | – |