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Table 2 Risk factors for CT in urine specimens from participants 18–49 years of age in Shandong, China

From: Prevalence, risk factors, and medical costs of Chlamydia trachomatis infections in Shandong Province, China: a population-based, cross-sectional study

  Male Female Denominatorc unweighted, weighted
% (95% CI) Crude OR Adjusted ORa 95% CI % (95% CI) Crude OR Adjusted ORb 95% CI Male Female
All ages 2.7% (1.6–3.8)     2.3% (1.5–3.2)     3495, 3622 3708, 3581
Age(years)   P = 0.02 P = 0.48    P = 0.08 P = 0.57    
 18–24 4.3% (0.0–8.8) 1.00 1.00 1.00–1.00 3.2% (0.4–6.1) 1.00 1.00 1.00–1.00 253, 851 194, 825
 25–29 2.3% (0.5–4.1) 0.52 0.91 0.24–3.48 2.9% (1.9–3.8) 0.88 2.23 0.72–6.86 780, 496 914, 499
 30–34 2.8% (1.3–4.2) 0.63 1.40 0.37–5.35 3.5% (2.6–4.4) 1.08 3.74 1.09–12.83 500, 469 555, 461
 35–39 2.7% (1.1–4.2) 0.61 1.40 0.37–5.21 1.4% (0.4–2.4) 0.42 1.54 0.58–4.06 557, 567 588, 559
 40–44 2.4% (1.3–3.5) 0.54 1.32 0.54–3.24 1.5% (0.4–2.6) 0.46 1.48 0.45–4.86 713, 667 735, 659
 45–49 0.8% (0.2–1.3) 0.17 0.40 0.15–1.03 1.6% (0.9–2.4) 0.50 1.81 0.60–5.45 692, 572 722, 578
Education   P = 0.70     P = 0.02 P = 0.07    
 Elementary school, or below 3.2% (0.0–8.3) 1.00 1.6% (1.1–2.2) 1.00 1.00 1.00–1.00 367, 330 806, 697
 Middle school 2.5% (1.4–3.5) 0.75 1.8% (1.2–2.3) 1.08 1.04 0.69–1.55 1906, 1830 1935, 1788
 Senior high school or technical school 3.3% (1.6–5.0) 1.02 3.1% (0.8–5.3) 1.90 1.52 0.80–2.92 920, 1040 669, 752
 College, university, or above 1.4% (0.0–3.1) 0.44 5.2% (0.0–10.6) 3.32 2.11 0.93–4.81 302, 422 298, 344
Marital status   P = 0.01 P = 0.45    P < 0.01 P < 0.01    
 Married 2.1% (1.5–2.8) 1.00 1.00 1.00–1.00 1.8% (1.2–2.4) 1.00 1.00 1.00–1.00 3164, 3043 3528, 3253
 Unmarried, divorced or widowed 5.4% (0.9–9.9) 2.61 1.45 0.55–3.84 7.8% (1.4–14.3) 4.65 3.64 1.63–8.13 331, 579 180, 328
Location of residence   P = 0.80     P = 0.22     
 urban 2.8% (1.1–4.5) 1.00 2.8% (1.0–4.5) 1.00 1708, 2063 1824, 2040
 rural 2.5% (1.2–3.9) 0.91 1.8% (1.3–2.2) 0.64 1787, 1559 1884, 3581
Living status   P = 0.01 P = 0.17    P = 0.75     
 living with family 2.3% (1.5–3.1) 1.00 1.00 1.00–1.00 2.3% (1.4–3.2) 1.00 3279, 3327 3538, 3320
 living with roommates 6.5% (0.0–17.8) 2.99 2.20 0.53–9.19 2.9% (0.0–9.3) 1.29 69, 99 54, 108
 living alone 7.3% (0.0–16.4) 3.38 1.77 0.50–6.22 2.8% (0.0–6.0) 1.21 147, 196 116, 153
Living with spoused   P = 0.01     P = 0.92     
 Yes 1.9% (1.5–2.3) 1.00 1.8% (1.1–2.5) 1.00 3080, 3149 3309, 3213
 No 10.4% (0.0–24.6) 5.93 1.9% (0.3–3.5) 1.06 84, 86 219, 244
Smoking   P = 0.18 P = 0.42    P = 0.31     
 No 2.1% (0.9–3.3) 1.00 1.00 1.00–1.00 2.3% (1.5–3.1) 1.00 1747, 1785 3309, 3527
 Yes 3.2% (1.5–4.9) 1.58 1.36 0.65–2.86 5.9% (0.0–16.5) 2.68 1748, 1837 70, 54
STI in the past 5 yearse   P = 0.01 P = 0.08    P = 0.19 P = 0.13    
 No 2.5% (1.4–3.6) 1.00 1.00 1.00–1.00 2.3% (1.5–3.1) 1.00 1.00 1.00–1.00 3467, 3595 3697, 3572
 Yes 21.1% (0.0–54.8) 10.3 7.65 0.79–73.84 9.0% (0.0–28.4) 4.15 6.21 0.58–66.18 19, 27 11, 9
Age at first intercourse (years)   P = 0.01 P = 0.03    P < 0.01 P = 0.24    
 >20 1.8% (1.4–2.3) 1.00 1.00 1.00–1.00 1.9% (1.2–2.6) 1.00 1.00 1.00–1.00 2698, 2549 3308, 3000
  ≤ 20 4.6% (1.0–8.2) 2.58 1.76 1.05–2.94 4.7% (2.5–7.0) 2.59 1.94 0.64–5.90 797, 1073 400, 581
Number of sex partners   P < 0.01 P = 0.02    P < 0.01 P = 0.04    
  1 2.1% (1.5–2.8) 1.00 1.00 1.00–1.00 2.0% (1.2–2.7) 1.00 1.00 1.00–1.00 3086, 3107 3597, 3441
  ≥ 2 6.0% (1.5–10.4) 2.92 2.09 1.10–3.94 11.5% (0.0–23.3) 6.47 3.66 1.07–12.48 409, 515 111, 140
Number of new sex partners in the past year   P = 0.14 P = 0.40    P = 0.44     
  ≤ 1 2.5% (1.4–3.7) 1.00 1.00 1.00–1.00 2.3% (1.5–3.1) 1.00 3375, 3459 3678, 3549
  ≥ 2 5.2% (0.5–9.8) 2.08 0.56 0.15–2.16 5.0% (0.0–12.0) 2.21 120, 163 30, 32
  1. Abbreviations: CT Chlamydia trachomatis, CI confidence interval, OR odds ratio, AOR adjusted odds ratio, STI sexually transmitted infection
  2. aAdjusted for age, marital status, living status, smoking, STI in the past 5 years, age at first intercourse, number of sex partners, number of new sex partners in the past year and smoking
  3. bAdjusted for age, education, marital status, STI in the past 5 years, age at first intercourse and number of sex partners
  4. cDenominator was participants with sex experience and a urine test result
  5. dThis variable included those who have been married
  6. eSTIs included syphilis, gonorrhea, chlamydia trachomatis infection, condyloma acuminatum, genital herpes, and HIV infection