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Table 1 Univariate analysis of sociodemographic and service-related characteristics associated with incident Chlamydia trachomatis infection among female and male soldiers, Fort Bragg, 2005-2010

From: Chlamydia trachomatis infection rates among a cohort of mobile soldiers stationed at Fort Bragg, North Carolina, 2005–2010

    Female       Male    
  TOTAL (n = 8909) PY (total = 12586.80)   Infected (total n = 922) n (%) Hazard ratio 95% CI TOTAL (n = 58516) PY (total = 88563.06)   Infected (total n = 1276) n (%) Hazard ratio 95% CI
Age (years)             
  17-20 2060 2694.47 426 (46) 6.60 (5.40-8.06) 14042 20964.21 468 (37) 3.71 (3.15-4.35)
  21-25 3273 4494.38 372 (40) 3.49 (2.85-4.28) 21334 30932.45 592 (46) 3.18 (2.72-3.72)
  26-67 3576 5397.95 124 (14) 1.00   23139 36663.82 216 (17) 1.00  
  Missing 0 0.00 0     1 2.58 1    
Race/ethnicity             
  Non-white 4667 6659.46 568 (62) 1.42 (1.24-1.62) 17595 26364.53 682 (54) 2.66 (2.38-2.97)
  Black 3093 4396.98 380 (42) 1.44 (1.24-1.66) 8913 13172.93 477 (38) 3.72 (3.30-4.20)
  Hispanic 1015 1493.41 121 (13) 1.36 (1.11-1.67) 6030 9293.29 157 (12) 1.74 (1.46-2.08)
  Other 559 769.07 67 (7) 1.44 (1.11-1.87) 2652 3898.31 48 (4) 1.26 (0.94-1.69)
  White 4048 5622.83 343 (38) 1.00   39916 60480.45 587 (46) 1.00  
  Unknown 194 304.51 11     1005 1718.09 7    
Pay grade             
  E1-E4 5674 7555.88 832 (90) 5.87 (4.72-7.30) 38439 55897.88 1101 (86) 3.59 (3.06-4.21)
  E5+ 3235 5030.92 90 (10) 1.00   20077 32665.18 175 (14) 1.00  
Education             
  High school or less 6270 8561.25 823 (91) 4.27 (3.40-5.35) 43876 65941.18 1171 (94) 4.52 (3.60-5.69)
  Some college or higher 2477 3770.11 82 (9) 1.00   13069 19997.24 78 (6) 1.00  
  Unknown 162 255.44 17     1571 2624.65 27    
Marital status             
  Single 4743 6443.52 667 (72) 2.43 (2.10-2.80) 34258 50574.89 936 (73) 2.03 (1.79-2.30)
  Non-single 4156 6122.33 254 (28) 1.00   24219 37913.03 340 (27) 1.00  
  Unknown 10 20.95 1     39 75.14 0    
History of prior PCS             
  0-3 5351 7280.65 739 (80) 2.87 (2.44-3.37) 36731 54302.64 968 (76) 1.95 (1.71-2.21)
  4-34 3558 5306.15 183 (20) 1.00   21785 34260.42 308 (24) 1.00  
Breaks in duty at Ft. Bragg             
  Yes 712 1306.37 894 (3) 0.29 (0.20-0.42) 3941 7118.61 30 (2) 0.28 (0.19-0.40)
  No 8197 11280.42 28 (97) 1.00   54575 81444.45 1246 (98) 1.00  
History of prior deployments             
  1-3 3338 5726.58 33 (4) 0.31 (0.22-0.44) 30292 54647.42 133 (10) 0.75 (0.63-0.90)
  None 5571 6860.22 889 (96) 1.00   28224 33915.64 1143 (90) 1.00  
Deployment during study             
  Yes 3338 5726.58 149 (16) 0.25 (0.21-0.29) 30292 54647.42 402 (32) 0.29 (0.26-0.33)
  No 5571 6860.22 773 (84) 1.00   28224 33915.64 874 (68) 1.00  
History of Ct             
  Yes 959 1299.81 98 (11) 1.02 (0.83-1.26) 1186 1706.80 48 (4) 2.00 (1.50-2.66)
  No 7950 11286.99 824 (89) 1.00   57330 86856.27 1228 (96) 1.00  
History of GC before entry and initial Ct             
  Yes 163 209.38 25 (3) 1.48 (0.99-2.20) 408 632.66 49 (4) 5.29 (3.98-7.04)
  No 8746 12377.42 897 (97) 1.00   58108 87930.40 1227 (96) 1.00  
Months in service at entry             
  0 to 6 2081 2896.03 359 (39) 2.99 (2.56-3.49) 16900 25143.42 434 (34) 1.65 (1.45-1.88)
  7 to 14 2028 2660.21 274 (30) 2.42 (2.05-2.85) 13010 19074.37 383 (30) 1.90 (1.66-2.18)
  15 to 297 4800 7030.56 289 (31) 1.00   28606 44345.26 459 (36) 1.00  
Primary occupation specialty at entry             
  Combat 1782 2673.2 110 (12) 0.51 (0.42-0.62) 21004 32014.6 339 (27) 0.64 (0.57-0.73)
  Other 7127 9913.60 812 (88) 1.00   37512 56548.47 937 (73) 1.00  
  1. Note: CI - confidence interval; Other marital status - married, other; Other race/ethnicity - other, Asian/Pacific Islander, American Indian/Alaskan native; PCS - permanent change in station.