Table 3. Effects of CRP testing on secondary outcomes.

	GP use of CRP (N = 81) n (%)	Control (N = 99) n (%)	Odds ratio (95% CI)
Re-consultation for baseline episode of illness	27 (33)	34 (34)	0.95 (0.46 to1.99)
Antibiotics for baseline episode of illness	6 (7)	8 (8)	0.94 (0.33 to 2.63)
Non-urgent referral to secondary care for baseline episode of illness	3 (4)	5 (5)	0.93 (0.18 to 4.86)
Consultation for new episode of RTI within 3 months	13 (16)	29 (29)	0.61 (0.32 to 1.17)
Antibiotics for new episode of RTI within 3 months	2 (2)	7 (7)	0.34 (0.08 to 1.39)
Non-urgent referral to secondary care for new episode of RTI	3 (4)	7 (7)	0.54 (0.10 to 2.79)

CI = confidence interval. RTI = respiratory tract infection.