condition mean min max ZT0-3 63.033846 63.033846 63.033846 ZT4-7 80.0459475 80.0459475 80.0459475 ZT8-11 89.11279300000001 89.11279300000001 89.11279300000001 ZT12-15 69.888268 69.888268 69.888268 ZT16-19 78.4262775 78.4262775 78.4262775 ZT20-23 77.4555505 77.4555505 77.4555505