condition mean min max ZT0-3 4.942655 4.942655 4.942655 ZT4-7 3.04025 3.04025 3.04025 ZT8-11 3.00425 3.00425 3.00425 ZT12-15 4.83315 4.83315 4.83315 ZT16-19 4.91153 4.91153 4.91153 ZT20-23 4.991085 4.991085 4.991085