condition mean min max ZT0-3 17.023983333333334 12.2019 23.82825 ZT4-7 5.3849350000000005 5.3849350000000005 5.3849350000000005 ZT8-11 10.98425 10.98425 10.98425 ZT12-15 15.32925 11.65755 19.00095 ZT16-19 11.76159 11.76159 11.76159 ZT20-23 20.94825 20.94825 20.94825