condition mean min max ZT0-3 1.22901 1.22901 1.22901 ZT4-7 1.827685 1.827685 1.827685 ZT8-11 1.55437 1.55437 1.55437 ZT12-15 0.5565175 0.5565175 0.5565175 ZT16-19 0.839679 0.839679 0.839679 ZT20-23 0.9383825 0.9383825 0.9383825