condition mean min max ZT0-3 0.27724533333333334 0.180905 0.3414 ZT4-7 0.175893 0.175893 0.175893 ZT8-11 0.302391 0.302391 0.302391 ZT12-15 0.7147205 0.472014 0.957427 ZT16-19 0.345144 0.345144 0.345144 ZT20-23 0.42473550000000004 0.42473550000000004 0.42473550000000004