Table 2.

Percentage seropositive patients per time window (days post positive RT-PCR).

	Abbott anti-S			Abbott anti-N			P valuee
Non-severe patients	Negative	Positive	% positive [CI]	Negative	Positive	% positive [CI]
0−59 d	8	102	92.7% [86.1−96.5]	18	92	83.6% [75.5−89.5]	P = 0.06
60−119 d	2	68	97.1% [89.6−99.8]	11	59	84.3% [73.8−91.2]	P < 0.05
120−179 d	0	58	100% [92.6−100]	18	40	69.0%c [56.1−79.4]	P < 0.01
180−239 d	3	47	94.0% [83.2−98.6]	27	23	46.0%d [33.0−59.6]	P < 0.01
240−299 d	2	39	95.1% [83.0−99.5]	23	18	43.9%d [29.9−59.0]	P < 0.01
300−365 d	6	27	81.8% [65.2−91.8]	23	10	30.3%d [17.3−47.5]	P < 0.01
Severe Patients	Negative	Positive	% positive [CI]	Negative	Positive	% positive [CI]
0−59 d	5	108	95.6% [89.8−98.4]	1	112	99.1%b [94.6−100]	P = 0.21
60−119 d	1	81	98.8% [92.8−100]	1	81	98.8%b [92.8−100]	P = 1.0
120−179 d	1	51	98.1% [88.9-100]	4	48	92.3%b,c [81.3−97.5]	P = 0.36
180−239 d	2	31	93.9% [79.4−99.3]	9	24	72.7%a,d [55.6−85.1]	P < 0.05
240−299 d	1	33	97.1% [83.8−100]	12	22	64.6%d [48.9−78.6]	P < 0.01
300−365 d	1	22	95.7% [77.3−100]	10	13	56.5%d [36.8−74.4]	P < 0.01

CI = 95% confidence interval.

^aP < 0.05 vs non-severe,

^bP < 0.01 vs non-severe,

^cP < 0.05 vs day 0 to 59,

^dP < 0.01 vs day 0 to 59,

^eAnti-S vs anti-N.