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Table 5 Characteristics of investigations in Zhejiang Province in 1998 and 2006

From: The survey of serum retinol of the children aged 0~4 years in Zhejiang Province, China

Survey date Sample resource Sample size(n) Male/ female Detection method Serum retinol(μmol/L) No. Of VAD(%)
October 1998 13 counties 1842 968/874 fluorescence 1.62 ± 0.92 145(7.8)
April2006 6 counties 357 188/169 HPLC-UV 1.65 ± 0.47 11(3.08)
  1. Incidence of VAD, χ2 = 10.41, P = 0.001