Table 1 Demographics and T-Spot results of all participants

Age (years), median (range)

34

(18 to 69)

73

(27 to 95)

44

(23 to 60)

71

(25 to 93)

Male, n (%)†

25

(17)

60

(45)

7

(32)

77

(49)

Ethnicity, n (%)

  White Caucasian

-

-

133

(99)

20

(91)

156

(100)

  Hispanic

-

-

1

(0.7)

0

(0)

0

(0)

  Asian‡

-

-

0

(0)

2

(9)

0

(0)

BCG (history or scar), n (%)

  Yes

119

(84)

55

(41)

18

(82)

75

(48)

  No

8

(5.6)

57

(43)

3

(14)

50

(32)

  Unknown

1

(0.7)

22

(16)

1

(5)

30

(19)

TSpot result including initial borderline results, n, (%) (95%CI)

  Positive

14

(9.9)

(5.0 to 15)

28

(21)

(14 to 27)

2

(9.1)

(0 to 21)

13

(8.3)

(4.0 to 13)

  Borderline positive

2§

(1.4)

(0 to 3.3)

3

(2.2)

(0 to 4.7)

0

(0)

(N/A)

5

(3.2)

(0.44 to 6.0)

  Borderline negative

6§

(4.2)

(0.92 to 7.5)

1

(0.7)

(0 to 2.2)

1

(4.5)

(0 to 13)

2

(1.3)

(0 to 3.0)

  Negative

120

(85)

(79 to 90)

102

(76)

(68 to 82)

19

(86)

(72 to 100)

136

(87)

(82 to 92)

TSpot result excluding those borderline results which were not retested, n, (%) (95%CI)

  Positive

16

(11)

(6.1 to 16)

28

(22)

(14 to 29)

2

(9.5)

(0 to 22)

13

(8.7)

(4.2 to 13)

  Negative

126

(89)

(84 to 94)

102

(78)

(71 to 85)

19

(90)

(78 to 100)

136

(91)

(87 to 96)