Table 1

Frequencies and incidence rates of repeat diagnoses of genital C trachomatis infections during follow up of a cohort of previously infected US army soldiers, 1994–July 1999

Incident cases (%)Person years of follow upRepeat diagnoses (per 1000 person years)Rate ratio (RR) (95% CI)
*Mean ages: women = 22.46 years, men = 23.77 years.
†Grades E1–E4 approx $11 520 to $17 820; grades E5–O4, $18 168 to $40 716 per annum (1998 US$).
Overall87916903.2652.00
Sex
Female557 (63.4) 8466.4465.791.72 (1.50–1.98)
Male322 (36.6) 8436.8138.171.00
Age*
<20134 (15.2) 3023.2944.323.50 (1.54–7.93)
20–24557 (63.4) 9002.2161.874.89 (2.19–10.92)
25–29146 (16.6) 3285.1844.443.51 (1.55–7.94)
30–34 36 (4.1) 1118.8232.182.54 (1.07–6.03)
35+ 6 (0.7) 473.7512.661.00
Race
Black558 (63.5) 9831.4056.761.17 (0.92–1.47)
White240 (27.3) 5406.4244.390.91 (0.71–1.17)
Other 81 (9.2) 1665.4348.641.00
Marital status
Married234 (26.7) 5631.8441.550.87 (0.62–1.23)
Single607 (69.1)10474.0857.951.22 (0.88–1.69)
Other 38 (4.3) 797.3447.661.00
Military rank (grade)†
PVT (E1–E2)152 (17.3) 3969.6938.291.27 (1.00–1.62)
PFC-CPL (E3–E4)613 (69.7) 9147.4567.012.22 (1.82–2.72)
SGT-LTC (E5–O5)114 (12.9) 3784.5230.121.00