condition mean min max ZT0-3 19.72445 19.72445 19.72445 ZT4-7 21.3266 21.3266 21.3266 ZT8-11 21.88445 21.88445 21.88445 ZT12-15 17.66505 17.66505 17.66505 ZT16-19 15.53725 15.53725 15.53725 ZT20-23 15.833499999999999 15.833499999999999 15.833499999999999