condition mean min max ZT0-3 193.373304 193.373304 193.373304 ZT4-7 172.908275 172.908275 172.908275 ZT8-11 143.91566 143.91566 143.91566 ZT12-15 173.2913765 173.2913765 173.2913765 ZT16-19 173.6679775 173.6679775 173.6679775 ZT20-23 211.50739 211.50739 211.50739