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Body and bladder weights for the four age groups. Body weights are preanesthesia, while bladder weights are empty wet. Weights and ratio trend upward with increasing age. Bars show means ± SE; P values for overall comparison. ANOVA was used where noted; otherwise, a Kruskal-Wallace test was performed. 2P < 0.05 vs. Mature. 3P < 0.05 vs. Old. 4P < 0.05 vs. Oldest-old. P for linear trend is reported where applicable.
