condition mean min max ZT0-3 2.8288533333333334 1.51396 3.7186150000000002 ZT4-7 1.39292 1.39292 1.39292 ZT8-11 1.6705 1.6705 1.6705 ZT12-15 2.546125 2.25092 2.84133 ZT16-19 3.56206 3.56206 3.56206 ZT20-23 4.828805 4.828805 4.828805