condition mean min max ZT0-3 13.664549 13.664549 13.664549 ZT4-7 14.6231465 14.6231465 14.6231465 ZT8-11 12.7977865 12.7977865 12.7977865 ZT12-15 12.5181595 12.5181595 12.5181595 ZT16-19 12.706902 12.706902 12.706902 ZT20-23 12.690232 12.690232 12.690232