condition mean min max ZT0-3 261.79999999999995 261.79999999999995 261.79999999999995 ZT4-7 244.6 244.6 244.6 ZT8-11 243.39999999999998 243.39999999999998 243.39999999999998 ZT12-15 305.2 305.2 305.2 ZT16-19 326.05 326.05 326.05 ZT20-23 270.25 270.25 270.25