condition mean min max ZT0-3 15.8685 14.782 16.955 ZT4-7 10.5709 10.5709 10.5709 ZT8-11 12.9395 12.9395 12.9395 ZT12-15 0 0 0 ZT16-19 14.48545 14.48545 14.48545 ZT20-23 14.42295 14.42295 14.42295