“a slightly increasing trend”

In men, there was a decreasing trend of − 14.5% (95% CI: − 54.6 to 60.8) between 2004 and 2006, then a slightly increasing trend in the mid Joinpoint (2006–2013; APC, 4.4; 95% CI: − 6.4 to 16.5), and a significant increase of 139.9% (95% CI: 62.4 to 254.2; P ≤ 0.05) between 2013 and 2015.

4 c), whereas glucose and fructose concentration showed a slightly increasing trend (Fig. 4 d, e).