Table 4.

Comparison between the dichotomized 4AT and the corresponding scores on the OBS scale (n = 200)

	4AT < 4p (n = 162)	4AT ≥ 4p (n = 38)	p valuec
	Median (QL-QUb)	Median (QL-QUb)
OBS Total scorea	6 (3–14)	35 (24–48)	<  0.001
OBS score part I	3 (0–9)	24 (12–29)	<  0.001
OBS score part II	2 (0–5)	14 (8–20)	<  0.001

^a Total score = OBS scale part I + part II

^b QL-QU = Quartile, Lower – Quartile, Upper

^c Based on the Mann-Whitney U test