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Table 1 Number and proportion of confirmed pertussis cases 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 < 1 year Percent 1 to < 5 years Percent 5 to < 10 years Percent 10 to < 20 years Percent ≥20 years Percent Total Percent
2001 73 (81.11) 6 (6.67) 3 (3.33) 4 (4.44) 4 (4.44) 90 (100)
2002 46 (83.64) 3 (5.45) 2 (3.64) 4 (7.27) 55 (100)
2003 77 (89.53) 4 (4.65) 1 (1.16) 2 (2.33) 2 (2.33) 86 (100)
2004 99 (86.09) 7 (6.09) 2 (1.74) 2 (1.74) 5 (4.35) 115 (100)
2005 116 (68.24) 6 (3.53) 8 (4.71) 17 (10.00) 23 (13.53) 170 (100)
2006 72 (75.00) 8 (8.33) 2 (2.08) 6 (6.25) 8 (8.33) 96 (100)
2007 518 (80.31) 38 (5.89) 13 (2.02) 23 (3.57) 53 (8.22) 645 (100)
2008 214 (80.15) 22 (8.24) 4 (1.50) 10 (3.75) 17 (6.37) 267 (100)
2009 107 (74.31) 12 (8.33) 2 (1.39) 6 (4.17) 17 (11.81) 144 (100)
2010 156 (85.71) 7 (3.85) 4 (2.20) 2 (1.10) 13 (7.14) 182 (100)
2011 718 (78.38) 67 (7.31) 21 (2.29) 35 (3.82) 75 (8.19) 916 (100)
2012 755 (72.53) 135 (12.97) 27 (2.59) 44 (4.23) 80 (7.68) 1041 (100)
2013 1079 (66.89) 231 (14.32) 90 (5.58) 68 (4.22) 145 (8.99) 1613 (100)
2014 1359 (62.95) 282 (13.06) 163 (7.55) 98 (4.54) 257 (11.90) 2159 (100)
2015 339 (61.41) 77 (13.95) 51 (9.24) 29 (5.25) 56 (10.14) 552 (100)
χ2   148.24   68.20   63.05   0.31   14.22   
p   < 0.01   < 0.01   < 0.01   0.57   < 0.01