. 2016 Nov 2;63(Suppl 4):S142–S147. doi: 10.1093/cid/ciw560

Table 1.

Pertussis Case Distribution and Incidence per Age and Sex, During Epidemic Years, Niakhar, Senegal, 1984–1996

Age	First Outbreak (1986)				Second Outbreak (1990)				Third Outbreak (1993)
	Cases		No. of PYR	Incidence per 1000 PYR	Cases		No. of PYR	Incidence per 1000 PYR	Cases		No. of PYR	Incidence per 1000 PYR
	No.	%	No. of PYR	Incidence per 1000 PYR	No.	%	No. of PYR	Incidence per 1000 PYR	No.	%	No. of PYR	Incidence per 1000 PYR
0–5 mo	97	7	582	166.6	68	6	557	122.1	38	4	575	66.1
6–23 mo	246	18	1443	170.5	144	12	1700	84.7	58	7	1598	36.3
2–4 y	492	35	2530	194.5	348	30	2850	122.1	241	27	2969	81.2
5–14 y	570	40	6481	88	612	52	7422	82.5	555	62	7811	71.1
Total (0–14 y)	1405	100	11 036	127.3	1172	100	12 529	93.5	892	100	12 953	68.9
Girls	721		5395	133.6	580		6093	95.2	462		6276	73.6
Boys	684		5641	121.3	592		6436	92.0	430		6677	64.4
Relative risk (girls/boys) (95% confidence interval)	1.1 (1.0, 1.2)				1.0 (.9, 1.2)				1.1 (1.0, 1.3)

Reproduced with permission from Preziosi et al [2].

Abbreviation: PYR, person-years at risk.