condition mean min max ZT0-3 17.894 17.69385 18.09415 ZT4-7 7.253499999999999 7.253499999999999 7.253499999999999 ZT8-11 9.336604999999999 9.336604999999999 9.336604999999999 ZT12-15 0 0 0 ZT16-19 13.775500000000001 13.775500000000001 13.775500000000001 ZT20-23 13.7564 13.7564 13.7564