condition mean min max ZT0-3 116.885662 116.885662 116.885662 ZT4-7 149.5012875 149.5012875 149.5012875 ZT8-11 67.499979 67.499979 67.499979 ZT12-15 65.2829625 65.2829625 65.2829625 ZT16-19 43.223558499999996 43.223558499999996 43.223558499999996 ZT20-23 33.81262 33.81262 33.81262