condition mean min max ZT0-3 14.98325 14.98325 14.98325 ZT4-7 8.781535 8.781535 8.781535 ZT8-11 10.334115 10.334115 10.334115 ZT12-15 11.0487 11.0487 11.0487 ZT16-19 14.24015 14.24015 14.24015 ZT20-23 10.99615 10.99615 10.99615