condition mean min max ZT0-3 37.882615 5.369495 63.4935 ZT4-7 46.0739 46.0739 46.0739 ZT8-11 42.43195 42.43195 42.43195 ZT12-15 61.5049 34.38965 88.62015 ZT16-19 99.97465 99.97465 99.97465 ZT20-23 120.628 120.628 120.628