| Partner | Index | ||
| N+T+ (N = 52) | N+T− (N = 31) | Total (N = 83) | |
| Concordant | |||
| N+T+ | 18 (35%) | 5 (16%) | 23 (28%) |
| N+T− | 7 (13%) | 5 (16%) | 12 (14%) |
| N−T+ | 14 (27%) | 4 (13%) | 18 (22%) |
| Total | 39 (75%) | 14 (45%) | 53 (64%) |
| Discordant | |||
| N−T− | 13 (25%) | 17 (55%) | 30 (36%) |
| Prevalence ratio 1.70 (95% CI 1.1 to 2.5) | |||
N+, Nucleic acid amplification test (NAAT) positive; T+, traditional assay positive; T−, traditional assay negative.
Concordant defined as NAAT and/or traditional assay positive for C trachomatis.
Disconcordant defined as NAAT and traditional assay negative for C trachomatis.
Tabulations include all partnerships with valid NAAT and traditional assay results: 72 index subjects with one partner, four indexes with two partners, and one index with three partners. Fourteen index subjects with N− results at follow-up (five N−T+ and nine N−T−) are considered N+ (based on their emergency department test result).
Prevalence ratio and 95% CI represent the outcome of partner status of concordant versus discordant by index status and were estimated from a generalised estimating equation logistic model that accounts for a lack of independence among index patients with multiple partners.