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