condition mean min max ZT0-3 172.924364 172.924364 172.924364 ZT4-7 136.479996 136.479996 136.479996 ZT8-11 148.34465749999998 148.34465749999998 148.34465749999998 ZT12-15 175.35778900000003 175.35778900000003 175.35778900000003 ZT16-19 298.03063 298.03063 298.03063 ZT20-23 255.760262 255.760262 255.760262