condition mean min max ZT0-3 213.35457325 200.0426074 226.6665391 ZT4-7 132.21122150000002 129.63166645 134.79077655 ZT8-11 135.00296215 127.15069205 142.85523225 ZT12-15 69.6443770975 49.17095599 90.11779820499999 ZT16-19 75.3838704075 70.44866148 80.319079335 ZT20-23 100.67513481 100.5747332 100.77553642