condition mean min max ZT0-3 46.74015 46.74015 46.74015 ZT4-7 30.96345 30.96345 30.96345 ZT8-11 41.2924 41.2924 41.2924 ZT12-15 47.20415 47.20415 47.20415 ZT16-19 51.1173 51.1173 51.1173 ZT20-23 46.33505 46.33505 46.33505