condition mean min max ZT0-3 25.75595391 21.31799302 30.193914799999998 ZT4-7 12.5594823905 12.143470879999999 12.975493901 ZT8-11 14.478329409999999 11.8676323 17.089026519999997 ZT12-15 16.34392031 15.671153409999999 17.01668721 ZT16-19 12.075260235 11.20846167 12.9420588 ZT20-23 11.222611486249999 10.3661270975 12.079095875