condition mean min max ZT0-3 1.700065 1.700065 1.700065 ZT4-7 1.21934 1.21934 1.21934 ZT8-11 1.353085 1.353085 1.353085 ZT12-15 1.41853 1.41853 1.41853 ZT16-19 2.20685 2.20685 2.20685 ZT20-23 1.526505 1.526505 1.526505