The calculated arithmetic means for spring and fall were intermediate values (logd0 = 4.65 and 4.29, respectively)
between those generated for the summer (logd0 = 6.19) and winter (logd0 = 1.75) seasons. The data variability difference between the predicted HPP treatments was observed clearly in the range of logdHPP (90% confidence) value for the 2 min (2.2–2.5 log units) and the 6 min (5.5–5.6 log units) processes (Fig. 4).