condition mean min max ZT0-3 11.313158 11.313158 11.313158 ZT4-7 10.456008 10.456008 10.456008 ZT8-11 8.547427 8.547427 8.547427 ZT12-15 9.4453085 9.4453085 9.4453085 ZT16-19 10.0056285 10.0056285 10.0056285 ZT20-23 9.310145 9.310145 9.310145