condition mean min max ZT0-3 3.9377283333333333 3.01229 4.52658 ZT4-7 2.699245 2.699245 2.699245 ZT8-11 2.785835 2.785835 2.785835 ZT12-15 4.620705 4.1426 5.09881 ZT16-19 4.48874 4.48874 4.48874 ZT20-23 3.8826 3.8826 3.8826