highly significantP < 0.001
Chi-square tests indicated highly significant differences in the proportions of both negative ( χ 2 = 33.719, P < 0.001) and positive ( χ 2 = 35.136, P < 0.001) cases among the different age groups, while Fisher's exact test for the borderline category showed no significant differences ( P = 0.806). 3.4.