condition mean min max ZT0-3 61.2235003025 39.936034915 82.51096569 ZT4-7 39.74452447 37.47922135 42.00982759 ZT8-11 38.211686900000004 37.693550735 38.729823065 ZT12-15 38.4679744125 38.41089835 38.525050475 ZT16-19 57.82461207 44.63619437 71.01302977 ZT20-23 179.07977527 136.85840503999998 221.30114550000002