condition mean min max ZT0-3 10.446926 10.446926 10.446926 ZT4-7 9.808174999999999 9.808174999999999 9.808174999999999 ZT8-11 9.9209865 9.9209865 9.9209865 ZT12-15 10.098235 10.098235 10.098235 ZT16-19 10.825163 10.825163 10.825163 ZT20-23 10.19866 10.19866 10.19866