condition mean min max ZT0-3 2721.776952 2721.776952 2721.776952 ZT4-7 1871.857464 1871.857464 1871.857464 ZT8-11 2027.1420309999999 2027.1420309999999 2027.1420309999999 ZT12-15 2200.3560605000002 2200.3560605000002 2200.3560605000002 ZT16-19 2336.7162395 2336.7162395 2336.7162395 ZT20-23 2735.8131750000002 2735.8131750000002 2735.8131750000002