condition mean min max ZT0-3 5.883005 5.883005 5.883005 ZT4-7 2.320515 2.320515 2.320515 ZT8-11 10.325025 10.325025 10.325025 ZT12-15 14.7689 14.7689 14.7689 ZT16-19 11.796800000000001 11.796800000000001 11.796800000000001 ZT20-23 6.29253 6.29253 6.29253