condition mean min max ZT0-3 8.013382499999999 7.79462 8.232145 ZT4-7 7.8127949999999995 7.8127949999999995 7.8127949999999995 ZT8-11 5.268245 5.268245 5.268245 ZT12-15 0 0 0 ZT16-19 7.32128 7.32128 7.32128 ZT20-23 9.501475 9.501475 9.501475