SARS-CoV-2 seroprevalence and associated factors of infection before and after the Delta wave in French Polynesia: a cross-sectional study

Table 1 Prevalence of anti-SARS-CoV-2-N IgG antibodies among study participants

	Participants n	Raw prevalence			Weighted prevalence
	Participants n	n	% [95% CI]	p-value	% [95% CI]
Total	1,120	503	44.9 [42.0–47.9]		56.8[53.4–60.2]
Age range (in years)				0.03
18–29	337	169	50.1 [44.7–55.6]
30–44	408	184	45.1 [40.2–50.1]
45–69	375	150	40.0 [35.0–45.2]
Gender				0.57
Male	536	236	44.0 [39.8–48.3]
Female	584	267	45.7 [41.6–49.9]
Archipelago				< 0.001
Society (WIs)	641	398	62.1 [58.2–65.9]		61.4 [57.5–65.1]
Society (LIs)	103	28	27.2 [18.9–36.8]		26.8 [19.1–36.2]
Austral	59	14	23.7 [13.6–36.6]		24.5 [14.9–37.5]
Marquesas	217	42	19.4 [14.3–25.2]		19.0 [14.2–24.8]
Tuamotu	59	10	16.9 [8.4–29.0]		15.6 [8.5–26.9]
Gambier	41	11	26.8 [14.2–42.9]		25.9 [14.8–41.4]
Period of inclusion				< 0.001
Before Delta wave (April-June 2021)	479	105	21.9 [18.3–25.9]		21.8 [18.1–25.9]
April-21	72	20	27.8 [17.9–40.0]
May-21	212	41	19.3 [14.3–25.3]
June-21	195	44	22.6 [16.9–29.1]
During/after Delta wave (July-December 2021)	641	398	62.1 [58.2–65.9]		61.4 [57.5–65.1]
July-21	230	101	43.9 [37.4–50.6]
Octobre-21	247	176	71.3 [65.2–76.8]
November-21	146	112	76.8 [69.0–83.3]
December-21	18	9	50.0 [26.0–74.0]
Self-reported number of SARS-CoV-2 infections^a				< 0.001
0	967	360	37.2 [34.2–40.4]
≥ 1	153	143	93.5 [88.3–96.8]

WIs Windward Islands, LIs Leeward Islands
^aNumber of positive tests (RT-PCR or antigenic) for SARS-CoV-2 detection performed by a health professional, as self-reported by the participant

ISSN: 1471-2458