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Table 2 Number and proportion of pertussis cases aged < 1 year-old by age group, from 2001 to 2015, São Paulo State, Brazil

From: Challenges of interpreting epidemiologic surveillance pertussis data with changing diagnostic and immunization practices: the case of the state of São Paulo, Brazil

Year < 2 months Percent 2 to < 6 months Percent 6 months to < 1 year-old Percent Total Percent
2001 28 (38.36) 40 (54.79) 5 (6.85) 73 (100)
2002 18 (39.13) 26 (56.52) 2 (4.35) 46 (100)
2003 28 (36.36) 47 (61.04) 2 (2.60) 77 (100)
2004 37 (37.37) 57 (57.58) 5 (5.05) 99 (100)
2005 45 (38.79) 65 (56.03) 6 (5.17) 116 (100)
2006 35 (48.61) 35 (48.61) 2 (2.78) 72 (100)
2007 48 (37.80) 71 (55.91) 8 (6.30) 127 (100)
2008 88 (41.12) 111 (51.87) 15 (7.01) 214 (100)
2009 43 (40.19) 60 (56.07) 4 (3.74) 107 (100)
2010 61 (39.10) 81 (51.92) 14 (8.97) 156 (100)
2011 249 (34.68) 410 (57.10) 59 (8.22) 718 (100)
2012 295 (39.07) 376 (49.80) 84 (11.13) 755 (100)
2013 400 (37.07) 588 (54.49) 91 (8.43) 1079 (100)
2014 509 (37.45) 736 (54.16) 114 (8.39) 1359 (100)
2015 105 (30.97) 195 (57.52) 39 (11.50) 339 (100)
χ2   2.31   0.22   12.03   
p   0.13   0.64   < 0.01