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Proportion of sample positivity with P. acnes in the infection and no infection groups. The colored areas represent the 95% confidence intervals. The proportion of positivity at day 7 was 55.4% and that at day 10 was 65.7% in the infection group. In the no infection group only 8.4% were positive at day 7 and 19.1% at day 10 (P < 0.0001), and discontinuation of sample cultivation would have resulted in missing 52 of 262 (19.9%) positive samples or 15 of 70 (21.4%) cases.
