condition mean min max ZT0-3 1077.796068 1077.796068 1077.796068 ZT4-7 1421.263037 1421.263037 1421.263037 ZT8-11 1328.82203 1328.82203 1328.82203 ZT12-15 1283.528409 1283.528409 1283.528409 ZT16-19 1183.3054865 1183.3054865 1183.3054865 ZT20-23 1132.29824 1132.29824 1132.29824