Table 3. Number of items included in the referrals from each group of primary care providers.

Primary care provider	Number of predefined items (mean)	Standard deviation	95% confidence interval
Primary care physicians (certified specialists)	5·90	2·35	5·39–6·40
Primary care physicians (without specialist certification)	5·83	2·35	5·47–6·18
Physicians in internship	6·60	3·31	4·23–8·97
Chiropractors	4·73	2·90	2·78–6·68
Manual physiotherapists	9·67	2·65	7·63–11·70