Supermarket visits | Total | ||||
≥2 per week | 1 per week | <1 per week, >1 per month | ≤1 per month | ||
TST | 2694 (20) | 3352 (25) | 3149 (24) | 4148 (31) | 13343 (100) |
TBI prevalence | |||||
Total+ | 107 (4.0)* | 98 (2.9)* | 65 (2.1)* | 70 (1.7) | 340 (2.5)* |
Remote§,ƒ | 40 (37) | 50 (51) | 47 (73) | 61 (87) | 198 (58) |
Recent§ | |||||
False positive | 5 (5) | 6 (6) | 6 (9) | 8 (11) | 25 (7) |
True positive | 62 (58) | 42 (43) | 12 (19) | 1 (1) | 117 (34) |
True recent TBI prevalence+ % | 2.3 | 1.3 | 0.4 | <0.1 | 0.9 |
Distribution of true recent TBI % | 53 | 36 | 10 | 1 | 100 |
Incremental yield %## | 40 | 10 | 1 | ||
Test requirement¶¶ | 43 | 80 | 262 | 4148 | 114 |
Data are presented as n (%), unless otherwise stated. #: sensitivity and specificity of TST are 79.8% and 99.8%, respectively 15; ¶: for 629 (4.5%) individuals with an available TST result, including 19 with positive TST, no exposure data were available; +: % of TST; §: % of total TBI; ƒ: expected age-adjusted prevalence of remote TBI, 0.0148, multiplied by number of TST; ##: proportion of true recent TBI identified additionally by screening in supermarket visit category indicated; ¶¶: number of subjects needed to be tested in order to identify one true recent TBI case, TST divided by true recent TBI. *: p<0.05 for comparison with expected age-adjusted prevalence of remote TBI of 1.48%.