condition mean min max ZT0-3 0.07853532499999999 0.0529805 0.10409014999999999 ZT4-7 0.052236 0.052236 0.052236 ZT8-11 0.053931 0.053931 0.053931 ZT12-15 0 0 0 ZT16-19 0.10437579999999999 0.10437579999999999 0.10437579999999999 ZT20-23 0.078269 0.078269 0.078269