condition mean min max ZT0-3 45.32975 29.3645 53.6836 ZT4-7 27.72315 27.72315 27.72315 ZT8-11 16.226100000000002 16.226100000000002 16.226100000000002 ZT12-15 12.2868775 9.960555 14.613199999999999 ZT16-19 13.77495 13.77495 13.77495 ZT20-23 25.891350000000003 25.891350000000003 25.891350000000003