condition mean min max ZT0-3 11.592553 11.592553 11.592553 ZT4-7 12.6381115 12.6381115 12.6381115 ZT8-11 13.0198555 13.0198555 13.0198555 ZT12-15 10.6572175 10.6572175 10.6572175 ZT16-19 12.982842 12.982842 12.982842 ZT20-23 10.9816055 10.9816055 10.9816055