condition mean min max ZT0-3 22.562569 22.562569 22.562569 ZT4-7 27.074634 27.074634 27.074634 ZT8-11 29.119718 29.119718 29.119718 ZT12-15 27.45366 27.45366 27.45366 ZT16-19 31.128440499999996 31.128440499999996 31.128440499999996 ZT20-23 34.420391 34.420391 34.420391