condition mean min max ZT0-3 10.829067 10.829067 10.829067 ZT4-7 10.805571 10.805571 10.805571 ZT8-11 10.4326395 10.4326395 10.4326395 ZT12-15 11.3273805 11.3273805 11.3273805 ZT16-19 10.734523500000002 10.734523500000002 10.734523500000002 ZT20-23 11.622498 11.622498 11.622498