condition mean min max ZT0-3 10.391312 10.391312 10.391312 ZT4-7 11.062212500000001 11.062212500000001 11.062212500000001 ZT8-11 9.7250385 9.7250385 9.7250385 ZT12-15 8.8943825 8.8943825 8.8943825 ZT16-19 9.786347 9.786347 9.786347 ZT20-23 9.2857965 9.2857965 9.2857965