Table 1

Number of trials subject to mandatory reporting which had reported results, grouped by phase of study

Phase	No with results	Total	Percentage
II	34	329	10
III	73	229	32
IV	56	180	31
Total	163	738	22

χ² test for effect of study phase (II, III, or IV) influencing proportion of trials with results: P=4.4×10⁻¹¹.