It is often the case that different textbooks will disagree on content pertaining to the same area or topic, perhaps due to the different approaches, their respective schools of thought, the sources/references cited by the different authors and the high degree of adaptability of the human body (which sometimes mean that what is abnormal in one person may be normal in another and vice-versa).
Multiple sources quote 7 degrees of ‘toe – out’ as normal in mature adults. Below are some excerpts:
‘Foot angle (degree of toe-out) is the angle between the line of progression of the body and the longitudinal axis of the foot. It is 7 degrees in healthy adults. Walking speed decreases as the angle of toe-out decreases’. [1]
and
‘The angle of progression is the angle formed between the line of progression in a straight line and a line that bisects the foot at the heel’s midpoint and runs between the second and third toes. Out-toeing of about 7 degrees is typical in mature adults’. [2]
From [1] above, it may be the case that an increased angle of toe-out is being referenced with a concomitant increase in walking speed. If this is the case, then a toe-out angle greater than 7 degrees may be considered abnormal. Kindly cross-check the primary reference cited by Oatis.
Reference 1, Reference 2: Houglum PA, Bertoli DB. Brunnstrom’s Clinical Kinesiology. 6th edition, 2012. Chapter 12; Stance and gait. Pg 547.
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