condition mean min max ZT0-3 31.910375 29.965049999999998 33.8557 ZT4-7 17.794249999999998 17.794249999999998 17.794249999999998 ZT8-11 10.10557 10.10557 10.10557 ZT12-15 0 0 0 ZT16-19 15.936300000000001 15.936300000000001 15.936300000000001 ZT20-23 20.2671 20.2671 20.2671