condition mean min max ZT0-3 3.8118433339999998 3.573950103 4.049736565 ZT4-7 3.6605994730000004 3.2906732325 4.0305257135 ZT8-11 2.8094423959999997 2.617742398 3.001142394 ZT12-15 4.307633940500001 2.982576334 5.632691547 ZT16-19 5.784490860249999 5.2025936745 6.366388045999999 ZT20-23 7.3038468545 7.1631488775 7.4445448315