condition mean min max ZT0-3 1.0028986666666666 0.7253365 1.23455 ZT4-7 1.25008 1.25008 1.25008 ZT8-11 0.970545 0.970545 0.970545 ZT12-15 1.975825 1.74627 2.20538 ZT16-19 2.011515 2.011515 2.011515 ZT20-23 1.96265 1.96265 1.96265