condition mean min max ZT0-3 68.824813 68.824813 68.824813 ZT4-7 18.0743295 18.0743295 18.0743295 ZT8-11 11.408530500000001 11.408530500000001 11.408530500000001 ZT12-15 11.317919 11.317919 11.317919 ZT16-19 13.871312 13.871312 13.871312 ZT20-23 14.6452615 14.6452615 14.6452615