condition mean min max ZT0-3 22.726975000000003 19.5213 25.932650000000002 ZT4-7 26.5481 26.5481 26.5481 ZT8-11 22.19075 22.19075 22.19075 ZT12-15 0 0 0 ZT16-19 15.7406 15.7406 15.7406 ZT20-23 21.11575 21.11575 21.11575