Question: fhp_category = factor( fhp_category, levels = 0:7, labels = c(0-10 mm, 10-20 mm, 20-30 mm, 30-40 mm, 40-50 mm, 50-60 mm, 60-70 mm, 70+ mm),
fhp_category = factor( fhp_category, levels = 0:7, labels = c("0-10 mm", "10-20 mm", "20-30 mm", "30-40 mm", "40-50 mm", "50-60 mm", "60-70 mm", "70+ mm"), ordered = TRUE ) )
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