Table 1. Counts of influenza-negative ILI by income group and data missingness.

Measure	Overall	HICs	U-MICs	L-MICs	LICs
Weekly influenza-negative ILI cases, median (IQR)
2015–2020	69 (20–268)	206.5 (33–1,553.5)	164 (68–528)	33 (15–99.3)	19 (9–38)
2015–2019	71 (23–257.8)	194 (33–1,452)	165 (72–491.2)	34 (17–103)	20 (10–39)
2020	54 (8–381)	274 (16.5–1,854)	155 (30–857)	23 (3–83.5)	15 (4–30)
Missing observations for influenza-negative ILI, n/N (%)	413/8,792 (4.7)	178/2,198 (8.1)	85/2,826 (3.0)	70/2,198 (3.2)	80/1,570 (5.1)

HICs, high-income countries; ILI, influenza-like illness; IQR, interquartile range; L-MICs, lower-middle-income countries; LICs, low-income countries; U-MICs, upper-middle-income countries.