condition mean min max ZT0-3 159.509467 159.509467 159.509467 ZT4-7 103.7108375 103.7108375 103.7108375 ZT8-11 109.02175299999999 109.02175299999999 109.02175299999999 ZT12-15 102.7175135 102.7175135 102.7175135 ZT16-19 74.3865525 74.3865525 74.3865525 ZT20-23 50.595516 50.595516 50.595516