condition mean min max ZT0-3 15.708333333333332 13.886949999999999 18.318649999999998 ZT4-7 17.11435 17.11435 17.11435 ZT8-11 18.5639 18.5639 18.5639 ZT12-15 24.849775 23.4628 26.23675 ZT16-19 22.7107 22.7107 22.7107 ZT20-23 21.8765 21.8765 21.8765