condition mean min max ZT0-3 19.5111 19.5111 19.5111 ZT4-7 21.143900000000002 21.143900000000002 21.143900000000002 ZT8-11 13.367899999999999 13.367899999999999 13.367899999999999 ZT12-15 12.2637 12.2637 12.2637 ZT16-19 13.926749999999998 13.926749999999998 13.926749999999998 ZT20-23 17.5844 17.5844 17.5844