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Table 2 Comparison of active/ passive surveillance group participants to the diagnostic ward in terms of baseline characteristics and other variables

From: Incidence of tuberculosis among school-going adolescents in South India

Variable Active surveillance (N = 341) (%) Passive surveillance (N = 277) (%) P value
Gender    
 Male 203 (59.5) 113 (40.8)  
 Female 138 (40.5) 164 (59.2) <0.001
Age    
 12–13 years 38 (11.1) 33 (11.9)  
 14–15 years 171 (50.1) 163 (58.8)  
 16–17 years 87 (25.5) 72 (26.0) <0.001
 18–20 years 45 (13.2) 9 (3.2)  
Referral Reason    
 Symptoms suggestive of TB 22 (6.5) 4 (1.4) 0.002
 Significant TB exposure 17 (5.0) 12 (4.3) 0.84
 TST ≥ 10 mm 191 (56.0) 186 (67.1) 0.005
 TST conversion 69 (20.2) 54 (19.5) 0.84
 Symptoms and TST conversion 1 (0.3) 0 (0.0) N.A
 Contact and TST ≥ 10 mm 2 (0.6) 0 (0.0) N.A
 Symptoms and TST ≥ 10 mm 8 (2.3) 2 (0.7) 0.19
 Symptoms and TB contact 2 (0.6) 0 (0.0) N.A
 Self-referral 2 (0.6) 8 (2.9) 0.04
Weight loss ≥ 2 weeks    
 Yes 9 (2.6) 1 (0.4)  
 No 332 (97.4) 276 (99.6) 0.02
Haemoptysis    
 Yes 4 (1.2) 2 (0.7)  
 No 337 (98.8) 275 (99.3) 0.69
Cough ≥ 2 weeks    
 Yes 38 (11.1) 10 (3.6)  
 No 303 (88.9) 267 (96.4) <0.001
Fever ≥ 2 weeks    
 Yes 18 (5.3) 6 (2.2)  
 No 323 (94.7) 271 (97.8) 0.05
Night sweats ≥ 2 weeks    
 Yes 6 (1.8) 1 (0.4)  
 No 335 (98.2) 276 (99.6) 0.13
Subject diagnosed as Pulmonary TB prior to DGW visit    
 Yes 1 (0.3) 1 (0.4)  
 No 340 (99.7) 276 (99.6) 1.0
Significant TB exposure    
 Yes 35 (10.3) 34 (12.3)  
 No 306 (89.7) 243 (87.7) 0.44
Caste    
Dalit/ Harijan (socially disadvantaged community) 68 (19.9) 44 (15.9)  
 Others 273 (80.1) 233 (84.1) 0.20
Mother’s education    
 Illiterate 147 (43.1) 127 (45.8)  
 Primary education or more 193 (56.6) 149 (53.8) 0.51
Father’s education    
 Illiterate 82 (24.0) 78 (28.2)  
 Primary education or more 258 (75.7) 196 (70.8) 0.23
Type of house walls    
 Brick 272 (79.8) 235 (84.8)  
 Others 69 (20.2) 42 (15.2) 0.11
Type of cooking fuel    
 Wood 283 (83.0) 236 (85.2)  
 Others 58 (17.0) 41 (14.8) 0.14
Final Diagnosis    
 Definite TB 4 (1.2) 4 (1.4) 1.0
 Radiological evidence of TB 4 (1.2) 2 (0.7) 0.69
 NTM isolated 71 (20.8) 48 (17.3) 0.30
 Negative for Pulmonary TB 254 (74.5) 217 (78.3) 0.29
  1. Missing data: Referral Reason–38 (6.1 %), Mother’s education–2 (0.3 %), Father’s education–4 (0.6 %), Final Diagnosis–12 (1.9 %)
  2. DGW diagnostic ward, TST tuberculin skin test, N.A not applicable, Referral reason – Referral criteria to the DGW; Symptoms suggestive of Pulmonary Tuberculosis (PTB) include Cough ≥ 2 weeks, Fever ≥ 2 weeks, Recent Weight loss for ≥ 2 weeks, Night sweats ≥ 2 weeks, Haemoptysis; Significant TB exposure - History of positive TB contact (for more than 8 h/week); Definite TB – Isolation of Mycobacterium tuberculosis from the either one or both sputum samples on GenoType MTBC test kit (HAIN kit); Radiological evidence of TB - chest x-ray (posterior-anterior view) had been reported as abnormal for TB by at least two radiologists; NTM (Non-Tuberculous Mycobacteria) isolated from the either one or both sputum samples on GenoType Mycobacterium CM kit