condition mean min max ZT0-3 8.1688775 6.570285 9.76747 ZT4-7 9.051235 9.051235 9.051235 ZT8-11 9.504574999999999 9.504574999999999 9.504574999999999 ZT12-15 0 0 0 ZT16-19 11.94715 11.94715 11.94715 ZT20-23 14.134599999999999 14.134599999999999 14.134599999999999