Table 5.

Comparison of identified cases by RT-PCR and chest CT over time.

Days from symptom onset (days)	Chest CT	RT-PCR	P-value
	Cases (percentage, 95% CI)	Cases (percentage, 95% CI)
0	11/114 (10%, 4–15%)	25/114 (22%, 14–30%)	0.011
1	19/114 (17%, 10–24%)	44/114 (39%, 30–48%)	<0.001
2	31/114 (27%, 19–36%)	51/114 (45%, 36–54%)	0.006
3	35/114 (31%, 22–39%)	62/114 (54%, 45–64%)	<0.001
4	36/114 (32%, 23–40%)	72/114 (63%, 54–72%)	<0.001
5	42/114 (37%, 28–46%)	76/114 (67%, 58–76%)	<0.001
6	48/114 (42%, 33–51%)	85/114 (75%, 66–83%)	<0.001
7	53/114 (46%, 37–56%)	89/114 (78%, 70–86%)	<0.001
8	58/114 (51%, 42–60%)	97/114 (85%, 78–92%)	<0.001
9	60/114 (53%, 43–62%)	98/114 (86%, 80–92%)	<0.001
10	64/114 (56%, 47–65%)	102/114 (89%, 84–95%)	<0.001
11	67/114 (59%, 50–68%)	108/114 (95%, 91–99%)	<0.001
12	70/114 (61%, 52–71%)	110/114 (96%, 93–100%)	<0.001
13	72/114 (63%, 54–72%)	111/114 (97%, 94–100%)	<0.001
14	76/114 (67%, 58–76%)	112/114 (98%, 96–101%)	<0.001
15	76/114 (67%, 58–76%)	113/114 (99%, 97–101%)	<0.001
16	77/114 (68%, 59–76%)	113/114 (99%, 97–101%)	<0.001
17	77/114 (68%, 59–76%)	113/114 (99%, 97–101%)	<0.001
18	77/114 (68%, 59–76%)	114/114 (100%, 100–100%)	<0.001
19	77/114 (68%, 59–76%)	114/114 (100%, 100–100%)	<0.001
20	79/114 (69%, 61–78%)	114/114 (100%, 100–100%)	<0.001
21	80/114 (70%, 62–79%)	114/114 (100%, 100–100%)	<0.001
22	82/114 (72%, 64–80%)	114/114 (100%, 100–100%)	<0.001

Data are presented as cases (percentage), while percentage was calculated by the number of cases/114 cases. P-values comparing the differences of cumulative diagnosed cases between RT-PCR and CT at different time points are from chi-square test. P < 0.05 was considered as a statistically significant difference. 95% CI, 95% confidence interval.