condition mean min max ZT0-3 31.434084 31.434084 31.434084 ZT4-7 28.3993825 28.3993825 28.3993825 ZT8-11 43.5036685 43.5036685 43.5036685 ZT12-15 43.20676 43.20676 43.20676 ZT16-19 31.3692815 31.3692815 31.3692815 ZT20-23 25.934837 25.934837 25.934837