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Table 2 Percent of Positive Result, Overall and by Pretreatment Status

From: Impact of antibiotic pretreatment on cultures in children with osteomyelitis and septic arthritis: a retrospective review

Culture Type

N

Rate of Culture Positivity

Overall (%)

Pretreated (%)

Not Pretreated (%)

P-value

Effect Size

Blood Culture

525

221 (42%)

55 (44%)

166 (42%)

0.62

0.04

Bone Culture

90

63 (70%)

38 (75%)

25 (64%)

0.29

0.25

Joint Culture

265

103 (39%)

36 (39%)

67 (39%)

0.95

0.01

Other Culture

197

138 (70%)

103 (74%)

35 (61%)

0.09

0.26

  1. P-value: chi-squared test of independence between pretreated and not pretreated groups
  2. Effect size: standardized mean difference between pretreated vs. not pretreated groups