Table 3.

Official (OTPI) and estimated (ETPI) total proportion infected at the end of each pandemic wave and participant characteristics.

	March 3rd, 2021		July 26th, 2021		December 16th, 2021		Ratioa ETPI/OTPI [95% CI]
	(End of wave 1)		(End of wave 2)		(End of wave 3)
	OTPI (%)	ETPI % [95% CI]	OTPI (%)	ETPI % [95% CI]	OTPI (%)	ETPI % [95% CI]
Total	4	16 [14–17]	8	32 [29–35]	12	47 [42–52]	4.0 [3.6–4.5]
Men	4	15 [13–18]	8	31 [26–35]	12	45 [38–53]	3.9 [3.3–4.5]
Women	4	16 [14–19]	8	33 [28–38]	12	48 [42–56]	4.1 [3.6–4.8]
<20y	2	16 [13–20]	3	36 [28–45]	5	60 [47–75]	11.0 [8.6–13.8]
20–39y	6	16 [13–19]	12	31 [26–38]	16	43 [36–52]	2.7 [2.2–3.2]
40–59y	5	17 [14–19]	11	34 [29–39]	15	46 [40–54]	3.2 [2.7–3.7]
60y+	3	12 [9–15]	6	20 [15–25]	8	29 [22–37]	3.6 [2.7–4.6]
Non-metropolitan region	3	15 [13–17]	7	32 [28–37]	11	54 [46–63]	4.9 [4.2–5.7]
Metropolitan region	4	16 [14–18]	9	32 [28–36]	12	45 [40–51]	3.8 [3.4–4.3]

ETPI: estimated total proportion infected. OTPI: official total proportion infected. 95% confidence intervals are given in brackets. Note: OTPI in Table 3 was measured at the end of each wave, whereas OTPI in Table 2 was measured the day of the sample collection.

^aRatio after wave 3 (12/16/2021).