condition mean min max ZT0-3 782.816489 782.816489 782.816489 ZT4-7 636.091169 636.091169 636.091169 ZT8-11 776.1166149999999 776.1166149999999 776.1166149999999 ZT12-15 898.4540509999999 898.4540509999999 898.4540509999999 ZT16-19 854.900535 854.900535 854.900535 ZT20-23 792.0919524999999 792.0919524999999 792.0919524999999