condition mean min max ZT0-3 1503.6 1503.6 1503.6 ZT4-7 1111.9 1111.9 1111.9 ZT8-11 1066.4 1066.4 1066.4 ZT12-15 1291.75 1291.75 1291.75 ZT16-19 1314.6999999999998 1314.6999999999998 1314.6999999999998 ZT20-23 1419.35 1419.35 1419.35