condition mean min max ZT0-3 48.7778 48.7778 48.7778 ZT4-7 129.4395 129.4395 129.4395 ZT8-11 70.1071 70.1071 70.1071 ZT12-15 37.6762 37.6762 37.6762 ZT16-19 25.35475 25.35475 25.35475 ZT20-23 7.535645 7.535645 7.535645