Lebeouf, C, Jenkins, DJ, Smyth, RA, "Sacro-Occipital Technique: the So-called
Arm Fossa Test: Interexaminer Agreement and Post-treatment Changes," Journal
of Australian Chiropractic Association, 1988; 18(2): 67-8.

Forty-five subjects, previously found to display a positive arm-fossa test,
were re-examined by a blinded assessor after allocation into three groups: a
group given supine, so-called category II blocking (considered correct
treatment), a group given prone, so-called category I blocking (considered
incorrect treatment) and a control group who were given no therapy.
Eighty-six percent of the control group remained unchanged (good
intra-examiner agreement). Seventy-three percent of the `correctly' treated
group became negative, whereas those receiving `incorrect' blocking showed a
mixed response.