condition mean min max ZT0-3 10.466792 10.466792 10.466792 ZT4-7 12.8059 12.8059 12.8059 ZT8-11 10.6244535 10.6244535 10.6244535 ZT12-15 11.93917 11.93917 11.93917 ZT16-19 11.8133 11.8133 11.8133 ZT20-23 12.028843 12.028843 12.028843