condition mean min max ZT0-3 7.66191 7.2434650000000005 8.080354999999999 ZT4-7 8.975999999999999 8.975999999999999 8.975999999999999 ZT8-11 13.48515 13.48515 13.48515 ZT12-15 0 0 0 ZT16-19 14.987100000000002 14.987100000000002 14.987100000000002 ZT20-23 11.27235 11.27235 11.27235