condition mean min max ZT0-3 0.9718505000000001 0.9718505000000001 0.9718505000000001 ZT4-7 0.722822 0.722822 0.722822 ZT8-11 1.0534525 1.0534525 1.0534525 ZT12-15 1.50355 1.50355 1.50355 ZT16-19 2.186565 2.186565 2.186565 ZT20-23 1.4554 1.4554 1.4554