a decreasing trendp < 0.001
Quadratic trend analysis indicated that the SLD initially increased slightly but gradually exhibited a decreasing trend over time ( p < 0.001, η 2 = 0.751, Table 4 , Figure 4 ).
Quadratic trend analysis indicated that the SLD initially increased slightly but gradually exhibited a decreasing trend over time ( p < 0.001, η 2 = 0.751, Table 4 , Figure 4 ).