condition mean min max ZT0-3 0.085591 0.085591 0.085591 ZT4-7 0.049033999999999994 0.049033999999999994 0.049033999999999994 ZT8-11 0.04111 0.04111 0.04111 ZT12-15 0.039252800000000004 0.039252800000000004 0.039252800000000004 ZT16-19 0.0942338 0.0942338 0.0942338 ZT20-23 0.07334993333333334 0.07334993333333334 0.07334993333333334