In a study of pulmonary effects on guinea pigs, Lacroix et al. (A - 28) exposed 18 ovalbuminsensitized guinea pigs and 18 nonsensitized guinea pigs to regular air, benzaldehyde, and acetaldehyde. At the end of exposure, the guinea pigs were anesthetized and allergic responses were assessed in bronchoalveolar lavage (BAL). The following table shows the alveolar cell count by treatment group for the ovalbumin-sensitized and nonsensitized guinea pigs.

Test for differences

(a) between ovalbumin-sensitized and nonsensitized outcomes,

(b) among the three different exposures, and

(c) interaction. Let for all tests.