condition mean min max ZT0-3 9.4019425 8.379635 10.42425 ZT4-7 13.4418 13.4418 13.4418 ZT8-11 9.69604 9.69604 9.69604 ZT12-15 0 0 0 ZT16-19 11.548695 11.548695 11.548695 ZT20-23 14.50955 14.50955 14.50955