Table 1. Total published items, total citations and Hirsch h-index for researchers with different patterns of publishing presence in the scientific literature, 1996–2011.

	UCP			Non-UCP			Skip			Skip-1
Centile	Items	Total Cites	H-index	Items	Total Cites	H-index	Items	Total Cites	H-index	Items	Total Cites	H-index
99%	528	15769	61	53	984	15	46	859	14	207	6132	37
95%	297	8230	45	21	258	8	18	229	7	123	3136	28
90%	220	5647	38	11	109	5	10	98	4	98	2224	24
75%	142	3020	29	4	23	2	3	21	2	71	1297	19
Median	94	1536	21	1	3	1	1	3	1	53	712	14
25%	66	785	15	1	0	0	1	0	0	41	376	11
10%	50	415	11	1	0	0	1	0	0	34	200	8
Mean	122.7	2550	23.1	4.9	58	1.8	4.3	51	1.7	62.1	1069	15.4

The definitions of the 4 groups are: UCP – authors publishing in all 16 years (1996–2011); Non-UCP – authors not publishing in all 16 years (1996–2011); Skip – authors who skipped any of the 16 year(s), excepting those who have published consecutively for two or more years in the beginning of the 1996–2011 period but not after that, and those who published for two or more years at the end of this period but not before that; Skip-1– authors publishing in 15 of the 16 years, with the skipped year between 1997–2010.

The shown total cites and H-index are the average total cites and H-index for each centile in the respective group.