condition mean min max ZT0-3 14.789511 14.789511 14.789511 ZT4-7 26.4316295 26.4316295 26.4316295 ZT8-11 17.8093785 17.8093785 17.8093785 ZT12-15 19.3558715 19.3558715 19.3558715 ZT16-19 13.239834 13.239834 13.239834 ZT20-23 14.69478 14.69478 14.69478