condition mean min max ZT0-3 28.6407 16.9043 50.43645 ZT4-7 20.87945 20.87945 20.87945 ZT8-11 9.12364 9.12364 9.12364 ZT12-15 16.925275 13.3734 20.47715 ZT16-19 10.31287 10.31287 10.31287 ZT20-23 10.68365 10.68365 10.68365