condition mean min max ZT0-3 265.5 265.5 265.5 ZT4-7 248.5 248.5 248.5 ZT8-11 284.04999999999995 284.04999999999995 284.04999999999995 ZT12-15 277.79999999999995 277.79999999999995 277.79999999999995 ZT16-19 276.95 276.95 276.95 ZT20-23 273.6 273.6 273.6