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Were infants in the control group sicker?

The article by Belenky et al. in the December 1976 issue (Pediatrics 58:800, 1976) is a very important and thought provoking one which will undoubtedly stimulate a plethora of letters in addition to this one.
 Upon reviewing the article I noticed that, in each weight group studied, nearly twice as many infants in the treatment group were receiving intermittent positive pressure ventilation (IPPV) at entry into the study compared to the control group (50% vs. 25% at 1,001 to 1,500 gm, 33% vs. 17% at 1,501 to 2,000 gm, and 27% vs. 17% at 2,001 + gm), although as stated by the authors, these differences were not statistically significant.