condition mean min max ZT0-3 26.363500000000002 26.363500000000002 26.363500000000002 ZT4-7 35.0089 35.0089 35.0089 ZT8-11 22.575 22.575 22.575 ZT12-15 18.6307 18.6307 18.6307 ZT16-19 23.355400000000003 23.355400000000003 23.355400000000003 ZT20-23 22.80425 22.80425 22.80425