condition mean min max ZT0-3 10.7 10.7 10.7 ZT4-7 16.1 16.1 16.1 ZT8-11 24.0 24.0 24.0 ZT12-15 5.6499999999999995 5.6499999999999995 5.6499999999999995 ZT16-19 9.799999999999999 9.799999999999999 9.799999999999999 ZT20-23 14.05 14.05 14.05