condition mean min max ZT0-3 988.3499999999999 988.3499999999999 988.3499999999999 ZT4-7 864.8 864.8 864.8 ZT8-11 802.85 802.85 802.85 ZT12-15 820.95 820.95 820.95 ZT16-19 955.05 955.05 955.05 ZT20-23 932.4 932.4 932.4