condition mean min max ZT0-3 0.931684 0.931684 0.931684 ZT4-7 0.7882433333333333 0.7882433333333333 0.7882433333333333 ZT8-11 0.38747349999999997 0.38747349999999997 0.38747349999999997 ZT12-15 0.2492 0.2492 0.2492 ZT16-19 1.025873 1.025873 1.025873 ZT20-23 0.35617699999999997 0.35617699999999997 0.35617699999999997