Multilevel likelihood ratios are shown in Table 2. The
likelihood ratio for a score of 0 was less than 1, which reduces
the probability of pain that interferes with functioning. Scores
in the 1–3 range do not provide additional information because
the likelihood ratio is near 1.0, whereas scores of 4–6 and 7–10
increase the probability of functional interference. For example,
if the pretest probability of pain-related functional interference
for a given clinic patient was 40%, the posttest
probabilities corresponding to scores of 0, 1–3, 4–6, and 7–10
would be 21, 40, 64, and 79%, respectively.