condition mean min max ZT0-3 21.71405 21.71405 21.71405 ZT4-7 12.757 12.757 12.757 ZT8-11 12.41375 12.41375 12.41375 ZT12-15 19.52115 19.52115 19.52115 ZT16-19 22.7277 22.7277 22.7277 ZT20-23 32.08385 32.08385 32.08385