condition mean min max ZT0-3 16.762927 16.762927 16.762927 ZT4-7 11.97977 11.97977 11.97977 ZT8-11 14.7113115 14.7113115 14.7113115 ZT12-15 11.996758 11.996758 11.996758 ZT16-19 11.5721335 11.5721335 11.5721335 ZT20-23 11.89583 11.89583 11.89583