condition mean min max ZT0-3 9.962824999999999 9.38349 10.542159999999999 ZT4-7 9.61992 9.61992 9.61992 ZT8-11 11.06165 11.06165 11.06165 ZT12-15 0 0 0 ZT16-19 14.87845 14.87845 14.87845 ZT20-23 13.35435 13.35435 13.35435