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

Table 12 Distribution of MeSH terms referring to age groups, by main types of pneumonia studied in those groups

MeSH age	Pneumonia, Aspiration			Pneumonia, Bacterial			Pneumonia, Ventilator-Associated			Pneumonia, Pneumocystis			Pneumonia, Viral
MeSH age	N of docs	rank	%	N of docs	rank	%	N of docs	rank	%	N of docs	rank	%	N of docs	rank	%
Infant, newborn	51	9	4.61	143	10	3.15	80	10	5.20	112	10	9.24	35	10	2.65
Infant	98	8	8.85	140	5	10.58	89	8	5.79	278	4	22.94	278	4	22.94
Child, preschool	100	7	9.03	91	8	6.88	85	9	5.53	268	5	22.11	268	5	22.11
Child	117	5	10.57	124	6	9.37	100	7	6.50	222	7	18.32	222	7	18.32
Adolescent	107	6	9.67	148	4	11.19	145	5	9.43	250	6	20.63	250	6	20.63
Adult	280	3	25.29	548	1	41.42	493	3	32.05	397	1	32.76	397	1	32.76
Young adult	44	10	3.97	266	9	5.86	133	6	8.65	126	9	10.40	95	7	7.18
Middle aged	366	2	33.06	502	2	37.94	680	1	44.21	348	2	28.71	348	2	28.71
Aged	449	1	40.56	288	3	21.77	496	2	32.25	281	3	23.18	281	3	23.18
Aged, 80 and over	250	4	22.58	88	9	6.65	188	4	12.22	134	8	11.06	134	8	11.06

ISSN: 1471-2288