condition mean min max ZT0-3 916.591712 916.591712 916.591712 ZT4-7 679.325557 679.325557 679.325557 ZT8-11 642.7320565 642.7320565 642.7320565 ZT12-15 1319.323024 1319.323024 1319.323024 ZT16-19 1130.8461895 1130.8461895 1130.8461895 ZT20-23 1426.4685465 1426.4685465 1426.4685465