condition mean min max ZT0-3 33.25555 33.25555 33.25555 ZT4-7 20.874850000000002 20.874850000000002 20.874850000000002 ZT8-11 23.483449999999998 23.483449999999998 23.483449999999998 ZT12-15 29.24745 29.24745 29.24745 ZT16-19 39.56405 39.56405 39.56405 ZT20-23 41.20245 41.20245 41.20245