condition mean min max ZT0-3 10.72596 10.72596 10.72596 ZT4-7 12.7130665 12.7130665 12.7130665 ZT8-11 11.7403025 11.7403025 11.7403025 ZT12-15 11.8809525 11.8809525 11.8809525 ZT16-19 12.18945 12.18945 12.18945 ZT20-23 12.634232 12.634232 12.634232