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PATRICK C. FRIMAN, PHD
Children's Hospital of Philadelphia Children's Seashore House 34th Street and Civic Center Boulevard Philadelphia, PA 19104

Am J Dis Child. 1991;145(8):846.

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In Reply.—I appreciate Dr Lubicky's interest in my study of concurrent habits, but he has misunderstood it in two ways. First, it was not a study of thumb-sucking per se, but rather of covariation between chronic thumb-sucking and object attachment (ie, the "Linus" syndrome). To study this covariation, I treated thumb-sucking and measured, but did not treat, attachment. I followed guidelines derived from a thorough literature review for treatment of thumb-sucking.^1,2 These guidelines recommend that only children aged 5 years or older be treated to reduce thumb-sucking, and then only if the habit is chronic (ie, occurs in more than one environment, such as at home and at school). Thumb-sucking is common in young children, but chronic thumb-sucking in children aged 5 years and older is not. No incidence figures are available, but my estimate, based on 9 years of research on thumb-sucking, is that about 5% to . . . [Full Text PDF of this Article]

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