condition mean min max ZT0-3 31.362825 29.5111 33.21455 ZT4-7 39.15775 39.15775 39.15775 ZT8-11 33.32255 33.32255 33.32255 ZT12-15 0 0 0 ZT16-19 32.49465 32.49465 32.49465 ZT20-23 40.667950000000005 40.667950000000005 40.667950000000005