a decreasing trendp=0.001
By age group, there was a statistically significant increasing trend in the groups of patients aged 19 years or younger (p<0.001) and 20–29 years (p<0.001), and a decreasing trend in the groups of patients aged 30–39 years (p=0.001), 40–49 years (p<0.001) and 60–69 years (p=0.017).