condition mean min max ZT0-3 30.00258333333333 12.93985 39.502849999999995 ZT4-7 8.545725000000001 8.545725000000001 8.545725000000001 ZT8-11 11.91225 11.91225 11.91225 ZT12-15 15.46625 14.9158 16.0167 ZT16-19 21.71085 21.71085 21.71085 ZT20-23 37.55135 37.55135 37.55135