condition mean min max ZT0-3 462.845108 462.845108 462.845108 ZT4-7 527.7179655 527.7179655 527.7179655 ZT8-11 669.97453 669.97453 669.97453 ZT12-15 653.8656335000001 653.8656335000001 653.8656335000001 ZT16-19 390.9618065 390.9618065 390.9618065 ZT20-23 278.218459 278.218459 278.218459