Table 3.

Stratified multivariable negative binomial regression for average mentions per keyword by category

	Negative binomial regression
	Outcome: mean mentions per EHC keyword		Outcome: mean mentions per comparison keyword
	IRR [95% C.I.]	P	IRR [95% C.I.]	P
WHO region
African region	Reference		Reference
Region of the Americas	0.48 [0.12, 1.97]	0.31	0.77 [0.50, 1.20]	0.26
Eastern Mediterranean region	0.17 [0.01, 2.44]	0.19	0.51 [0.31, 0.85]	0.01
European region	0.22 [0.03, 1.84]	0.16	0.69 [0.42, 1.14]	0.15
South-East Asian region	2.312 [0.59, 9.12]	0.23	0.42 [0.22, 0.82]	0.01
Western Pacific region	0.40 [0.07, 2.22]	0.29	0.56 [0.34, 0.92]	0.02
World Bank income group
High-income country	Reference		Reference
Upper-middle-income country	0.67 [0.15, 3.03]	0.61	1.61 [1.03, 2.51]	0.04
Lower-middle-income country	0.44 [0.08, 2.31]	0.33	1.47 [0.93, 2.31]	0.10
Low-income country	0.15 [0.02 1.46]	0.10	1.68 [0.96, 2.95]	0.07

Findings that were statistically significant (P < 0.05) are shown in bold.