Table 2

Diagnostic accuracy of JCard measurements by parents for different TSB levels

JCard valueTSB (μmol/L)Sensitivity % (95% CI)Specificity % (95% CI)PPV % (95% CI)NPV % (95% CI)Positive likelihood ratio (95% CI)Negative likelihood ratio (95% CI)
7≥119.796.8
(95.6 to 97.8)		70.0
(61.0 to 78.0)		96.6
(95.3 to 97.6)		71.8
(62.7 to 79.7)		3.23
(2.5 to 4.2)		0.045
(0.03 to 0.06)
9≥153.995.2
(93.6 to 96.4)		84.5
(78.5 to 89.4)		97.0
(95.7 to 98.0)		77.1
(70.7 to 82.6)		6.14
(4.4 to 8.6)		0.057
(0.04 to 0.08)
9≥342.098.8
(93.4 to 100)		18.8
(16.5 to 21.3)		8.4
(6.8 to 10.4)		99.5
(97.3 to 100)		1.22
(1.2 to 1.3)		0.065
(0.01 to 0.5)
12≥205.294.1
(92.2 to 95.6)		72.1
(67.1 to 76.7)		88.6
(86.3 to 90.7)		84.1
(79.4 to 88.0)		3.37
(2.8 to 4.0)		0.082
(0.06 to 0.1)
12≥342.097.6
(91.5 to 99.7)		27.7
(25.1 to 30.5)		9.3
(7.4 to 11.4)		99.3
(97.6 to 99.9)		1.35
(1.3 to 1.4)		0.088
(0.02 to 0.3)
12≥427.5100
(75.3 to 100)		26.2
(23.7 to 28.9)		1.5
(0.8 to 2.6)		100.0
(98.8 to 100)		1.36
(1.3 to 1.4)		0.00
15≥256.579.9
(76.3 to 83.1)		66.7
(62.8 to 70.5)		68.9
(65.2 to 72.4)		78.3
(74.4 to 81.7)		2.40
(2.1 to 2.7)		0.30
(0.3 to 0.4)
15≥342.093.9
(86.3 to 98.0)		47.3
(44.3 to 50.3)		11.9
(9.5 to 14.7)		99.0
(97.7 to 99.7)		1.78
(1.6 to 1.9)		0.13
(0.06 to 0.3)
15≥427.5100
(75.3 to 100)		44.9
(42.0 to 47.8)		2.0
(1.1 to 3.4)		100
(99.3 to 100)		1.81
(1.7 to 1.9)		0.00
18≥307.836.4
(30.0 to 43.1)		86.8
(84.5 to 88.9)		39.2
(32.5 to 46.3)		85.4
(83.0 to 87.6)		2.76
(2.2 to 3.5)		0.73
(0.7 to 0.8)
18≥342.052.4
(41.1 to 63.6)		85.1
(82.8 to 87.2)		21.1
(15.7 to 27.3)		95.9
(94.5 to 97.1)		3.47
(2.7 to 4.5)		0.56
(0.4 to 0.7)
18≥427.576.9
(46.2 to 95.0)		83.1
(80.8 to 85.2)		4.9
(2.4 to 8.8)		99.7
(99.1 to 99.9)		4.55
(3.3 to 6.3)		0.28
(0.1 to 0.7)

  • JCard, jaundice colour card; NPV, negative predictive value; PPV, positive predictive value; TSB, total serum bilirubin.