Table 2.

Odd Ratios and 95% Confidence Intervals From Multinomial Logistic Regression Models Predicting Illness Severity From Human Coronavirus (HCoV) Type and Age Group

	Severity Group, Odds Ratio (95% Confidence Interval)a
	Mild	Moderate	Severe
HCoV type
229E	Ref	1.51 (1.00–2.29)	1.82 (1.01–3.27)
HKU1	Ref	1.13 (.77–1.66)	1.51 (.88–2.59)
NL63	Ref	0.88 (.65–1.20)	0.59 (.35–.99)
OC43	Ref	0.84 (.62–1.13)	0.87 (.55–1.37)
Age group, y
0–5	Ref	1.46 (1.04–2.04)	2.06 (1.27–3.33)
6–11	Ref	1.53 (1.11–2.11)	1.02 (.60–1.72)
12–17	Ref	0.99 (.62–1.61)	0.71 (.31–1.62)
18–49	Ref	0.55 (.40–.74)	0.59 (.37–.94)
≥50	Ref	0.63 (.24–1.61)	1.23 (.40–3.80)

^aOdds ratios are relative to all other groups within category (ie, 229E vs not, 0–5 y vs not).