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Result: Statistical analysis showed a confidence interval overlap for flow rates in nonkinked versus kinked catheters sizes 14 G, 16 G and 18 G indicating that kinking does not significantly alter flow rate in these catheters. Ambiguity in the 20 G catheter data suggests that a greater sample size should be examined. Analysis of the 22 G catheter data showed a statistically significant decrease in flow rate when kinked.
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Nagle et al. (2015) studied this question.
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