condition mean min max ZT0-3 19.216616666666667 18.04815 20.937350000000002 ZT4-7 19.02975 19.02975 19.02975 ZT8-11 14.21045 14.21045 14.21045 ZT12-15 24.274524999999997 23.4334 25.11565 ZT16-19 18.873150000000003 18.873150000000003 18.873150000000003 ZT20-23 30.053350000000002 30.053350000000002 30.053350000000002