condition mean min max ZT0-3 11.58111111 11.58111111 11.58111111 ZT4-7 37.219999999 37.219999999 37.219999999 ZT8-11 7.754999999 7.754999999 7.754999999 ZT12-15 8.307777778 8.307777778 8.307777778 ZT16-19 8.834444445666668 8.834444445666668 8.834444445666668 ZT20-23 8.825555555333334 8.825555555333334 8.825555555333334