condition mean min max ZT0-3 1.1105853333333333 0.929028 1.2519365 ZT4-7 1.236085 1.236085 1.236085 ZT8-11 0.6011694999999999 0.6011694999999999 0.6011694999999999 ZT12-15 0.990837 0.6732440000000001 1.30843 ZT16-19 0.6923429999999999 0.6923429999999999 0.6923429999999999 ZT20-23 1.115515 1.115515 1.115515