condition mean min max ZT0-3 10.807905 6.92666 15.778300000000002 ZT4-7 13.372 13.372 13.372 ZT8-11 16.367800000000003 16.367800000000003 16.367800000000003 ZT12-15 10.92122 7.77869 14.06375 ZT16-19 10.675105 10.675105 10.675105 ZT20-23 8.676005 8.676005 8.676005