condition mean min max ZT0-3 23.18845 17.726950000000002 26.618949999999998 ZT4-7 14.192 14.192 14.192 ZT8-11 18.1523 18.1523 18.1523 ZT12-15 28.323900000000002 28.044 28.6038 ZT16-19 34.766 34.766 34.766 ZT20-23 42.25695 42.25695 42.25695