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Table 1 Age and sex distribution of residual sera collected from Guangzhou

From: Population seroprevalence of antibody to influenza A(H7N9) virus, Guangzhou, China

Characteristic Phase 1 (December 2013 through April 2014) (n = 2660) Phase 2 (October 2014 through December 2014) (n = 2680)
Age group, years
 0–14 185 (7.0 %) 140 (5.2 %)
 15–24 415 (15.6 %) 445 (16.6 %)
 25–54 1137 (42.7 %) 1166 (43.5 %)
 55–64 340 (12.8 %) 397 (14.8 %)
  ≥ 65 583 (21.9 %) 532 (19.9 %)
Sex
 Male 1336 (50.2 %) 1240 (46.3 %)
 Female 1324 (49.8 %) 1440 (53.7 %)