condition mean min max ZT0-3 9.857728 9.857728 9.857728 ZT4-7 9.4360845 9.4360845 9.4360845 ZT8-11 9.170234 9.170234 9.170234 ZT12-15 9.8226125 9.8226125 9.8226125 ZT16-19 9.2034695 9.2034695 9.2034695 ZT20-23 9.5344945 9.5344945 9.5344945