condition mean min max ZT0-3 17.798875000000002 9.113825 23.437600000000003 ZT4-7 11.937100000000001 11.937100000000001 11.937100000000001 ZT8-11 14.51695 14.51695 14.51695 ZT12-15 22.598625 19.501199999999997 25.69605 ZT16-19 30.363999999999997 30.363999999999997 30.363999999999997 ZT20-23 35.0107 35.0107 35.0107