condition mean min max ZT0-3 8.784707 8.784707 8.784707 ZT4-7 9.6060645 9.6060645 9.6060645 ZT8-11 10.140914500000001 10.140914500000001 10.140914500000001 ZT12-15 9.346516000000001 9.346516000000001 9.346516000000001 ZT16-19 10.382984 10.382984 10.382984 ZT20-23 8.9747395 8.9747395 8.9747395