TABLE 3.

Secondary outcomes

	Before PS matching			After PS matching
	Triage group (n = 363)	After examination group (n = 2191)	Odds ratio (95% CI)	Triage group (n = 329)	After examination group (n = 329)	Odds ratio (95% CI)
Further test	25 (6.9%)	529 (24.1%)	0.23 (0.15–0.35)	25 (7.6%)	73 (22.2%)	0.29 (0.17–0.48)
Chest radiograph	16 (4.4%)	317 (14.5%)	0.27 (0.15–0.46)	16 (4.9%)	40 (12.2%)	0.37 (0.19–0.69)
Computed tomography of chest	0	23 (1.0%)	0 (0–1.04)	0	3 (0.9%)	0 (0–2.42)
Blood test	16 (4.4%)	336 (15.3%)	0.25 (0.14–0.43)	16 (4.9%)	44 (13.4%)	0.33 (0.17–0.62)
Blood culture	12 (3.3%)	155 (7.1%)	0.45 (0.22–0.82)	12 (3.6%)	14 (4.3%)	0.85 (0.35–2.02)
Urine test	7 (1.9%)	151 (6.9%)	0.27 (0.10–0.57)	7 (2.1%)	14 (4.3%)	0.49 (0.16–1.31)
Urine culture	0	7 (0.3%)	0 (0–4.19)	0	0	NA
Cerebrospinal fluid analysis	0	0	NA	0	0	NA
Any parenteral medications	17 (4.7%)	272 (12.4%)	0.34 (0.20–0.57)	16 (4.9%)	38 (11.6%)	0.39 (0.20–0.74)
Parenteral antibiotics	2 (0.6%)	50 (2.3%)	0.23 (0.03–0.91)	2 (0.6%)	2 (0.6%)	1 (0.07–13.90)
Any prescription	136 (37.5%)	951 (43.4%)	0.78 (0.62–0.99)	129 (39.2%)	137 (41.6%)	0.90 (0.65–1.25)
Antibiotic prescription	17 (4.7%)	203 (9.3%)	0.48 (0.27–0.80)	16 (4.9%)	25 (7.6%)	0.62 (0.30–1.24)
Any anti‐influenza medications	44 (12.1%)	216 (9.9%)	1.26 (0.87–1.79)	42 (12.8%)	38 (11.6%)	1.12 (0.68–1.84)
Bounce‐back admission within 3 days	0	28 (1.3%)	0 (0–0.84)	0	2 (0.6%)	0 (0–5.32)
Bounce‐back admission within 7 days	0 (16.3%)	42 (1.9%)	0 (0–0.55)	0	3 (0.9%)	0 (0–2.42)
			Median Difference (95% CI)			Median Difference (95% CI)
Cost (yen, thousand), median (IQR)	14.3 (12.1–17.2)	14.6 (11.5–18.7)	6.4 (0.50–12.70)	14.3 (11.9–17.2)	15.0 (12.4–18.5)	10.7 (2.60–18.50)

CI, confidence interval; IQR, interquartile range; NA, not applicable; PS, propensity score.