condition mean min max ZT0-3 33.2575 33.2575 33.2575 ZT4-7 90.78115 90.78115 90.78115 ZT8-11 56.54005 56.54005 56.54005 ZT12-15 34.23395 34.23395 34.23395 ZT16-19 16.3722 16.3722 16.3722 ZT20-23 20.93995 20.93995 20.93995