condition mean min max ZT0-3 282.08633333333336 257.8505 321.1795 ZT4-7 276.6135 276.6135 276.6135 ZT8-11 326.756 326.756 326.756 ZT12-15 348.60450000000003 327.863 369.346 ZT16-19 468.3325 468.3325 468.3325 ZT20-23 308.1785 308.1785 308.1785