condition mean min max ZT0-3 29.031950000000002 29.031950000000002 29.031950000000002 ZT4-7 21.4217 21.4217 21.4217 ZT8-11 21.7971 21.7971 21.7971 ZT12-15 27.708550000000002 27.708550000000002 27.708550000000002 ZT16-19 29.72775 29.72775 29.72775 ZT20-23 32.5591 32.5591 32.5591