condition mean min max ZT0-3 35.13984491 26.01740389 44.26228593 ZT4-7 16.32415662 14.813914189999998 17.834399050000002 ZT8-11 25.678995397500003 18.93989684 32.418093955 ZT12-15 43.9554678375 40.14575696 47.765178715000005 ZT16-19 50.82743053 48.757964169999994 52.89689689 ZT20-23 62.18276894750001 55.24571244 69.11982545500001