condition mean min max ZT0-3 21.7334630675 20.499151155 22.96777498 ZT4-7 8.73790957375 7.1201651095 10.355654038 ZT8-11 6.87842747125 5.7416512055 8.015203737 ZT12-15 13.358776169999999 11.11888114 15.598671199999998 ZT16-19 16.1520575925 14.43810964 17.866005545 ZT20-23 21.57929216 20.351590225000002 22.806994095