| Variables | Median (range) or n (%)* |
| Age in years (range) | 23 (16–25) |
| Country of birth | |
| Australia | 568 (57.5) |
| Other† | 419 (42.5) |
| Preferred language other than English | |
| No | 800 (81.1) |
| Yes‡ | 187 (18.9) |
| Socio-economic indexes for areas¶ | |
| 1 | 241 (24.4) |
| 2 | 147 (14.9) |
| 2,3 | 108 (10.9) |
| 3 | 175 (17.7) |
| 4 | 95 (9.6) |
| Number of prior births | |
| 0 | 660 (66.9) |
| 1 | 252 (25.5) |
| >1 | 73 (7.4) |
| Self-report of prior chlamydia testing | |
| Yes | 131 (13.3) |
| No | 708 (71.7) |
| Unsure | 141 (14.4) |
| Months since last chlamydia test (range)§ | 18 (1–96) |
| Gestation in weeks (range) | 27 (5–42) |
| No. of male sexual partners in past year (range) | 1 (0–50) |
*The total numbers may not equal 987 because of missing data; †19% were born in Asia, 6.7% in Africa, 5.2% in Europe, 5.1% in the Middle East, 3.7% in New Zealand and 1.4% in the Pacific; 2% were identified as Aboriginal or Torres Strait Islander;
‡preferred languages other than English included Arabic (3%), languages from Sudan and the horn of Africa (3%), Vietnamese (2.5%), Indian languages (2.2%), Chinese languages (1.7%), Urdu (1.3%), Dari (0.6%), Khmer (0.6%), Macedonian (0.5%) and Turkish (0.5%); ¶Socio-Economic Indexes for Areas (SEIFA) indicate a continuum of advantage (high values) to disadvantage (low values) and have been allocated based on postal area of residence. The index takes into account variables such as income, education and employment. Some postal areas cross-multiple SEIFA areas: only the most frequent combinations have been listed; §self-reported estimate from the 131 women who reported prior chlamydia testing.