Hi everyone,
I have a question regarding the restricted cubic spline model shown in the picture here. This is taken from the paper. I am wondering why the confidence interval around 6 looks like that. Can someone explain it in really simple terms? I have no clue how to explain this.
This is what is said under the caption. This diagram is for the paper: http://eurheartj.oxfordjournals.org/content/35/27/1817
Figure 1
Adjusted restricted cubic spline model showing the hazard ratios (95% confidence intervals) for the association of high-sensitivity cardiac troponin T with incident dementia [among the 6321 participants with high-sensitivity cardiac troponin T concentrations within the measuring range (≥3 ng/L)]. Knots at 4, 6, and 14 ng/L (10th, 50th, and 90th percentiles). Histogram shows the distribution of concentrations of high-sensitivity cardiac troponin T within the measuring range. Data truncated at 97.5 percentile of high-sensitivity cardiac troponin T. Model is adjusted for age (continuous), race/field centre (Washington County, Maryland whites; suburbs of Minneapolis, Minnesota whites; Forsyth County, North Carolina whites; Forsyth County, North Carolina blacks; Jackson, Mississippi blacks), sex (male; female), education level (<high school; high school or equivalent; college, graduate or professional school), income (<$35 000/year; ≥$35 000/year; not reported), body mass index (continuous), physical activity (continuous), alcohol consumption (current high; current low; former; never), smoking (current; former; never), total cholesterol (continuous), HDL cholesterol (continuous), diabetes (yes; no), systolic and diastolic blood pressure (continuous), and blood pressure-lowering medication (yes; no).
Thank you.
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