condition mean min max ZT0-3 15.558433333333333 14.02225 17.5486 ZT4-7 14.42185 14.42185 14.42185 ZT8-11 10.426335 10.426335 10.426335 ZT12-15 15.054224999999999 13.9758 16.132649999999998 ZT16-19 11.09215 11.09215 11.09215 ZT20-23 15.3357 15.3357 15.3357