condition mean min max ZT0-3 0.2623568333333333 0.160795 0.34467 ZT4-7 0.3513155 0.3513155 0.3513155 ZT8-11 0.682408 0.682408 0.682408 ZT12-15 0.9563452499999999 0.5824125 1.3302779999999998 ZT16-19 0.7088835 0.7088835 0.7088835 ZT20-23 0.43109200000000003 0.43109200000000003 0.43109200000000003