condition mean min max ZT0-3 219.290217 219.290217 219.290217 ZT4-7 415.0841165 415.0841165 415.0841165 ZT8-11 370.90156850000005 370.90156850000005 370.90156850000005 ZT12-15 321.2888305 321.2888305 321.2888305 ZT16-19 276.30772649999994 276.30772649999994 276.30772649999994 ZT20-23 228.667038 228.667038 228.667038