condition mean min max ZT0-3 0.36949350000000003 0.3678965 0.3710905 ZT4-7 0.357341 0.357341 0.357341 ZT8-11 0.20621050000000002 0.20621050000000002 0.20621050000000002 ZT12-15 0 0 0 ZT16-19 0.2840015 0.2840015 0.2840015 ZT20-23 0.46092750000000005 0.46092750000000005 0.46092750000000005