Table 8. Median procalcitonin (PCT) test results among patients with LRTI and viral detection (n = 438) in Sri Lanka, 2018–2021.

Procalcitonin (PCT) tests	Children n (%) / median (IQR)	Adults n (%) / median (IQR)	P value a
PCT (ng/mL)	0.4 (0.2–1.2)	0.1 (0.1–0.5)	0.9242
PCT ≤ 0.1 ng/mL	14 (17.3)	114 (42.9)	<0.001
PCT ≤ 0.25 ng/mL	33 (40.7)	171 (64.3)	<0.001
PCT ≤ 0.5 ng/mL	46 (56.8)	197 (74.1)	0.002

PCT = procalcitonin; IQR = interquartile range.

^a P values in bold are significant at <0.05.