condition mean min max ZT0-3 12.338836666666667 9.143360000000001 15.3077 ZT4-7 8.167195 8.167195 8.167195 ZT8-11 8.3807 8.3807 8.3807 ZT12-15 11.7649425 11.672685 11.8572 ZT16-19 12.2507 12.2507 12.2507 ZT20-23 15.386800000000001 15.386800000000001 15.386800000000001