a decreasing trendp < 0.001
an increasing trendp < 0.001
From 2007 to 2013, there was an increasing trend in the use of norepinephrine (VUI norepinephrine was 0.24 in 2007 and 0.46 in 2013; p < 0.001) and a decreasing trend in the use of phenylephrine (VUI phenylephrine was 0.20 in 2007 and 0.08 in 2013; p < 0.001).