condition mean min max ZT0-3 75.310768 75.310768 75.310768 ZT4-7 66.2701405 66.2701405 66.2701405 ZT8-11 77.2965955 77.2965955 77.2965955 ZT12-15 69.5290565 69.5290565 69.5290565 ZT16-19 114.509605 114.509605 114.509605 ZT20-23 118.0209755 118.0209755 118.0209755