condition mean min max ZT0-3 14.10455 12.663599999999999 15.5455 ZT4-7 10.08773 10.08773 10.08773 ZT8-11 17.667749999999998 17.667749999999998 17.667749999999998 ZT12-15 0 0 0 ZT16-19 20.02465 20.02465 20.02465 ZT20-23 15.98885 15.98885 15.98885