condition mean min max ZT0-3 13.62784 13.62784 13.62784 ZT4-7 12.5175555 12.5175555 12.5175555 ZT8-11 11.056473 11.056473 11.056473 ZT12-15 19.806451000000003 19.806451000000003 19.806451000000003 ZT16-19 14.6820065 14.6820065 14.6820065 ZT20-23 42.171911 42.171911 42.171911