condition mean min max ZT0-3 726.460032 726.460032 726.460032 ZT4-7 683.0330295 683.0330295 683.0330295 ZT8-11 640.6198715 640.6198715 640.6198715 ZT12-15 742.8354015 742.8354015 742.8354015 ZT16-19 665.460936 665.460936 665.460936 ZT20-23 587.342658 587.342658 587.342658