condition mean min max ZT0-3 0.49176449999999994 0.3869185 0.5966104999999999 ZT4-7 0.823245 0.823245 0.823245 ZT8-11 0.275542 0.275542 0.275542 ZT12-15 0 0 0 ZT16-19 2.00463 2.00463 2.00463 ZT20-23 1.249173 1.249173 1.249173