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There’s no need to be vague about your regression model, let alone what you mean, precisely, by a trend test. A linear trend is better tested by running the model with walk as a continuous variable and taking the p-value from the regression table. analogous tests can be derived using -contrast- (see -help contrast-), but this is easier and more direct.
Based on your results, you’ll probably end up with a slight positive trend, but so what? You seem to have an inverse-U association with these categories, and that’s probably more interesting.
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