condition mean min max ZT0-3 17.564349999999997 16.4526 18.676099999999998 ZT4-7 33.3822 33.3822 33.3822 ZT8-11 39.25905 39.25905 39.25905 ZT12-15 0 0 0 ZT16-19 25.6181 25.6181 25.6181 ZT20-23 25.6572 25.6572 25.6572