condition mean min max ZT0-3 10.141265 10.141265 10.141265 ZT4-7 15.3346385 15.3346385 15.3346385 ZT8-11 13.0634915 13.0634915 13.0634915 ZT12-15 12.3425575 12.3425575 12.3425575 ZT16-19 11.4012085 11.4012085 11.4012085 ZT20-23 12.527767 12.527767 12.527767