condition mean min max ZT0-3 0.9492016666666666 0.9492016666666666 0.9492016666666666 ZT4-7 1.338585 1.338585 1.338585 ZT8-11 1.2291085 1.2291085 1.2291085 ZT12-15 0.6930164999999999 0.6930164999999999 0.6930164999999999 ZT16-19 0.889119 0.889119 0.889119 ZT20-23 1.52994 1.52994 1.52994