condition mean min max ZT0-3 19.100429 19.100429 19.100429 ZT4-7 26.6014265 26.6014265 26.6014265 ZT8-11 46.0771965 46.0771965 46.0771965 ZT12-15 45.9734675 45.9734675 45.9734675 ZT16-19 28.4770225 28.4770225 28.4770225 ZT20-23 20.1141265 20.1141265 20.1141265