condition mean min max ZT0-3 1.04559725 0.8748404999999999 1.216354 ZT4-7 3.709295 3.709295 3.709295 ZT8-11 3.219605 3.219605 3.219605 ZT12-15 0 0 0 ZT16-19 3.7283600000000003 3.7283600000000003 3.7283600000000003 ZT20-23 2.592965 2.592965 2.592965