condition mean min max ZT0-3 337.7 337.7 337.7 ZT4-7 282.6 282.6 282.6 ZT8-11 253.79999999999998 253.79999999999998 253.79999999999998 ZT12-15 321.1 321.1 321.1 ZT16-19 329.1 329.1 329.1 ZT20-23 293.65 293.65 293.65