condition mean min max ZT0-3 20.000975 18.7331 21.26885 ZT4-7 17.3664 17.3664 17.3664 ZT8-11 9.052355 9.052355 9.052355 ZT12-15 0 0 0 ZT16-19 7.376195 7.376195 7.376195 ZT20-23 14.671800000000001 14.671800000000001 14.671800000000001