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Table 1 Comparisons of baseline characteristics by new or previously treated cases (n = 669)

From: Predictors of pulmonary tuberculosis treatment outcomes in South Korea: a prospective cohort study, 2005-2012

Variables Group (%) P-value
   New case Previously treated case  
Demographic     
Gender Female 36 (16.1) 70 (15.7) 0.909
  Male 188 (83.9) 375 (84.3)  
Age 20-34 47 (21.0) 122 (27.4) 0.158
  35-49 95 (42.4) 183 (41.1)  
  50- 82 (36.6) 140 (31.5)  
Health condition     
BMI (n = 626) <18.5 108 (50.2) 204 (49.6) 0.887
  18.5- 107 (49.8) 207 (50.4)  
Diabetes No 180 (80.4) 340 (76.4) 0.246
  Yes 44 (19.6) 105 (23.6)  
Individual behavior     
Alcohol, within 6 months Less than once a week 102 (45.5) 245 (55.1) 0.062
  Several times a week 39 (17.4) 68 (15.3)  
  At least once a day 83 (37.1) 132 (29.7)  
Smoking, within 6 months Never smoked 56 (25.0) 125 (28.1) <0.001
< 1 pack/day 30 (12.39) 125 (28.1)  
1 pack/day 78 (34.8) 121 (27.2)  
> 1 pack/day 60 (26.8) 74 (16.6)  
Socioeconomic     
Residential area Small city and town 135 (60.3) 245 (55.1) 0.199
  Large city 89 (39.7) 200 (44.9)  
Education High school, above 120 (53.6) 251 (56.4) 0.487
  Middle school, below and refusal 104 (46.4) 194 (43.6)  
Occupation Health care, professional, office work 16 (7.1) 55 (12.4) 0.117
  Service sector and laborer in construction or factory 128 (57.1) 242 (54.4)  
  Unemployment and others 80 (35.7) 148 (33.3)  
Housing status (n = 668) Private 201 (89.7) 415 (93.5) 0.089
  Other 23 (10.3) 29 (6.5)  
Tuberculosis-related clinical     
Chest X ray     
Grade Minimal 10 (4.5) 9 (2.0) 0.020
  Moderately advanced 111 (49.6) 187 (42.0)  
  Far advanced 103 (46.0) 249 (56.0)  
Cavity Yes 138 (61.6) 281 (63.1) <0.001
  No 68 (30.4) 78 (17.5)  
  Not clear 18 (8.0) 86 (19.3)  
Bilateral Unilateral 57 (25.4) 56 (12.6) <0.001
  Bilateral 167 (74.6) 389 (87.4)  
Nodular lesion Yes 199 (88.8) 417 (93.7) 0.038*
  No 22 (9.8) 27 (6.1)  
  Not clear 3 (1.3) 1 (0.2)  
Treatment History     
Number of previous treatment episode (n = 444) 1 - 151 (33.9) -
2 - 106 (23.8)  
3 - 63 (14.2)  
4 or more - 125 (28.1)  
Cumulative duration of previous treatment (days, n = 444) Median (IQR) - 304 (61-761) -
History of failure (n = 445) No - 249 (56.0) -
  Yes - 196 (44.0)  
History of treatment interruption (n = 445) No - 207 (46.5) -
Yes - 238 (53.5)  
Drug Susceptibility pattern (n = 581) DS 146 (75.0) 92 (26.5) <0.001*
  Mono/Poly-R 29 (14.8) 44 (11.4)  
  Rif, mono-R 4 (2.0) 16 (4.2)  
  MDR 16 (8.2) 223 (57.9)  
AFB smear score at baseline     
- 1 (0.5) 4 (0.9) 0.689*
Scant 51 (22.8) 85 (19.1)  
  1+ 121 (54.0) 247 (55.5)  
  ≥2+ 51 (22.8) 109 (24.5)  
  1. *Tested by Fisher’s exact test.
  2. BMI: Body mass index; DS: Drug susceptible, Mono/poly-R: mono or poly-drug resistance that is not matched with the definition of Multidrug-resistant tuberculosis; MDR: multidrug-resistant tuberculosis.