Table 3. Mean potential citation impact (PCI=expected cites in 5 year window) for world oncology papers for 2000 (oncology) and for guideline references.

RL	N of oncology papers	N of guideline references	PCI of oncology papers	PCI of guideline references
Clinical
1–1.5	12 465	2316	9.6	21.5
1.5–2	4958	511	10.2	14.3
2–2.5	4747	217	10.0	12.1
2.5–3	2941	114	14.6	23.5
3–3.5	4976	38	18.9	24.8
Basic
3.5–4	5944	12	21.6	51.9