Free flu jabs were shunned by more than half the staff offered them at district health boards this year, prompting fears that vulnerable patients are being put at risk.
Only a third of midwives accepted the vaccination and just over half of doctors.
In the upper North Island, the highest overall rate was 54 per cent, at the Auckland District Health Board; Waitemata was lowest at 40 per cent. Counties Manukau was at 45 per cent and Waikato 44 per cent. The highest rate nationally was Canterbury's 62 per cent.
The national average was 46 per cent among most health occupational groups, although some health boards did not offer free jabs to all groups.
This is higher than rates of 20 to 40 per cent cited in a New Zealand Medical Journal article in 2007 which called for mandatory annual flu vaccination for all frontline health workers unless they had medical reasons not to have the injection.