condition mean min max ZT0-3 2311.033965 2311.033965 2311.033965 ZT4-7 990.201345 990.201345 990.201345 ZT8-11 917.6082185 917.6082185 917.6082185 ZT12-15 1149.754457 1149.754457 1149.754457 ZT16-19 1113.6962005 1113.6962005 1113.6962005 ZT20-23 997.3923465 997.3923465 997.3923465