condition mean min max ZT0-3 0.38488683333333334 0.346517 0.434164 ZT4-7 0.5388365 0.5388365 0.5388365 ZT8-11 0.34481249999999997 0.34481249999999997 0.34481249999999997 ZT12-15 0.1098864 0.10688955 0.11288325 ZT16-19 0.1493051 0.1493051 0.1493051 ZT20-23 0.626332 0.626332 0.626332