What is the expected number of infants in DBP quintile 2 with a preferential salt taste response under the null hypothesis? 

Hypertension

A study was performed relating neonatal blood-pressure level to neonatal taste responsiveness (Zinner et al. [29]). To assess salt taste responsiveness, infants 2 to 4 days old were offered 3 solutions via nipple cannulas containing (i) water, (ii) water + 0.1 molar salt, and (iii) water + 0.3 molar salt. Infant blood pressure was measured separately with a Physiometrics machine at 2€“4 days of age. A comparison was made between the mean number of sucks per burst of sucking (MSB) on (water + 0.3 molar salt) minus the MSB on water alone = Δ MSB. If Δ MSB ‰¤ ˆ’ 10, it was considered an aversive response; if Δ MSB > 0, it was considered a preferential response; otherwise, it was considered a neutral response. For the purposes of this question, the neutral response infants were eliminated and we compare the distribution of diastolic blood pressure between the aversive and preferential response infants. The results are given in Table 10.46.

Table 10.46: Association between diastolic blood pressure (DBP) quintile and salt taste response

 

We wish to test whether there is an association between salt taste response and DBP quintile.

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Diastolic bp Quintile Diastolic bp Level (mm Hg) Salt Taste Response Aversive Salt Taste Response Preferential Percent Preferential 16 < 36 36.1-39.9 10 12 11 38% 60% 12 3 4 5 40.0-42.0 48% 42.1-49.9 19 79% 15 2 50 68%