condition mean min max ZT0-3 16.202533333333335 13.623249999999999 19.3073 ZT4-7 15.512 15.512 15.512 ZT8-11 11.7224 11.7224 11.7224 ZT12-15 18.500300000000003 16.78885 20.211750000000002 ZT16-19 16.95905 16.95905 16.95905 ZT20-23 21.057949999999998 21.057949999999998 21.057949999999998