condition mean min max ZT0-3 205.005457 205.005457 205.005457 ZT4-7 175.464666 175.464666 175.464666 ZT8-11 176.768107 176.768107 176.768107 ZT12-15 180.00237199999998 180.00237199999998 180.00237199999998 ZT16-19 163.3305975 163.3305975 163.3305975 ZT20-23 152.4494605 152.4494605 152.4494605