highly significantP < 0 . 001
The overall χ2 test revealed highly significant differences in RA positive rates across the six age groups ( χ2 = 628.95, df = 5, P < 0 . 001).
The overall χ2 test revealed highly significant differences in RA positive rates across the six age groups ( χ2 = 628.95, df = 5, P < 0 . 001).