condition mean min max ZT0-3 0.45796733333333334 0.45796733333333334 0.45796733333333334 ZT4-7 0.533812 0.533812 0.533812 ZT8-11 0.2206105 0.2206105 0.2206105 ZT12-15 0.46834299999999995 0.46834299999999995 0.46834299999999995 ZT16-19 0.697222 0.697222 0.697222 ZT20-23 0.6974739999999999 0.6974739999999999 0.6974739999999999