condition mean min max ZT0-3 13.543875 13.11175 13.975999999999999 ZT4-7 15.078050000000001 15.078050000000001 15.078050000000001 ZT8-11 42.0172 42.0172 42.0172 ZT12-15 0 0 0 ZT16-19 40.5464 40.5464 40.5464 ZT20-23 24.7454 24.7454 24.7454