BMC Medical Research Methodology

Table 4 Citation indicators for pneumonia research: rankings by 15 top-producing countries, geographic region and income (2001–2015)

From: A snapshot of pneumonia research activity and collaboration patterns (2001–2015): a global bibliometric analysis

	Citations		Citation Rate		H-index
Country
USA	316,942	Vietnam	50.79	USA	197
UK	62,612	Switzerland	42.94	UK	106
France	48,019	South Africa	42.85	France	96
Spain	43,459	New Zealand	40.49	Spain	96
Germany	43,436	Saudi Arabia	38.62	Germany	94
Canada	40,090	UK	38.44	Canada	88
Netherlands	34,798	Netherlands	38.20	Netherlands	88
Japan	30,978	Ireland	36.85	Japan	74
Italy	25,600	Canada	36.75	Switzerland	74
Switzerland	23,228	Sweden	36.65	Australia	71
Australia	22,440	Denmark	36.53	Italy	70
China	18,370	USA	36.28	Belgium	62
Belgium	13,919	Spain	34.74	Sweden	56
Sweden	12,203	Belgium	34.71	Denmark	55
Brazil	11,136	Finland	34.17	China	54
Geographic area
North America	341,438	North America	35.76	North America	202
Europe & Central Asia	270,237	Europe & Central Asia	29.20	Europe & Central Asia	172
East Asia & Pacific	96,628	Sub-Saharan Africa	31.41	East Asia & Pacific	103
Latin America & Caribbean	22,740	Middle East & North Africa	24.00	Latin America & Caribbean	61
Sub-Saharan Africa	16,426	Latin America & Caribbean	20.69	Sub-Saharan Africa	54
Middle East & North Africa	14,159	East Asia & Pacific	20.38	Middle East & North Africa	53
South Asia	9254	South Asia	20.07	South Asia	46
Countries by income
HIC	593,632	HIC	29.53	HIC	222
UMIC	58,785	LMIC	21.82	UMIC	89
LMIC	17,523	LIC	21.46	LMIC	60
LIC	4765	UMIC	19.00	LIC	34

HIC high-income countries, UMIC upper-middle-income countries, LMIC lower-middle-income countries, LIC low-income countries

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