Table 2.

Comparison of CT values and viral loads between non-VOC, Alpha and Delta variants of SARS-CoV-2 per age group.

	N	CT value			Viral Load (log10 copies/mL)
		Median	Mean	95% CI	Median	Mean	95% CI
Age group 0–20 years
Non-VOC period	960	22	23.35	22.93–23.76	5.41	5.08	4.97–5.20
Alpha period	1694	22	23.70	23.36–24.04	5.41	5.02	4.93–5.11
Delta period	108	18	19.75	18.52–20.98	6.55	6.11	5.80–6.43
Age group 21–40 years
Non-VOC period	2010	20	22.09	21.81–22.38	5.98	5.44	5.36–5.52
Alpha period	1955	20	22.12	21.81–22.43	5.98	5.44	5.36–5.52
Delta period	143	18	19.44	18.36–20.52	6.55	6.19	5.91–6.47
Age group 41–60 years
Non-VOC period	2346	20	21.55	21.29–21.81	5.98	5.58	5.51–5.65
Alpha period	2197	19	21.42	21.14–21.70	6.26	5.63	5.56–5.71
Delta period	87	19	21.71	20.08–23.35	6.26	5.60	5.19–6.02
Age group 61+ years
Non-VOC period	3314	21	22.69	22.45–22.93	5.70	5.28	5.22–5.35
Alpha period	1331	20	22.05	21.66–22.43	5.98	5.47	5.37–5.57
Delta period	40	20	21.60	19.12–24.08	5.98	5.65	5.04–6.27