condition mean min max ZT0-3 8.7724975 8.62264 8.922355 ZT4-7 6.93098 6.93098 6.93098 ZT8-11 8.807945 8.807945 8.807945 ZT12-15 0 0 0 ZT16-19 12.9881 12.9881 12.9881 ZT20-23 10.99395 10.99395 10.99395