Table 2.

Characteristics of participants with tuberculin skin test by numbers of BCG scars in Las Pampas, Lima

	Number of BCG scars
Feature	No scar	One scar	Two scars	≥3 scars	P value
Participants, n	68	310	164	30
Age group, years
6–10	25	165	25
11–15	7	69	81	18
16–20	12	35	35	7
21–26	24	41	23	5
Mean age, years	15.5	12.1	14.8	15.4	<0.001*
Female/male ratio	1.3	1.0	1.0	0.9	0.625†
Mean body mass index (≥15 years)	23.5	23.1	22.9	23.3	0.299*
Mean household income, $	187	177	181	168	0.266*
Secondary school completed (≥18 years), %	41.4	70.5	78.6	90	0.003†
Having a history of living with a patient with active tuberculosis within last 5 years, %	14.7	9.4	11.7	16.7	0.419†
Presence of another TST-positive person in the household, %	49.3	60.9	63.8	66.7	0.188†
Tuberculin skin test reaction size, n (%)
0 mm	34 (50.0)	124 (40.0)	42 (25.6)	5 (16.7)	<0.001†
1–4 mm	23 (33.8)	128 (41.3)	57 (34.8)	9 (30.0)	0.324†
5–9 mm	4 (5.9)	22 (7.1)	20 (12.2)	4 (13.3)	0.172 †
10–14 mm	1 (1.5)	13 (4.2)	16 (9.7)	7 (23.3)	<0.001†
≥15 mm	6 (8.8)	23 (7.4)	29 (17.7)	5 (16.7)	0.005†

^*Kruskal-Wallis H test.

^†χ² test.

BCG = bacille Calmette-Guérin; TST = tuberculin skin test.