TABLE 1 Characteristics of the Clinical Trials Enterprise, as Seen in the ClinicalTrials.gov Registry

  All Studies All
Interventional
Trials
Interventional
Trials, 2007-2010
Primary purpose, n/N (%)      
    Treatment 59,200/75,778
(78.1)
59,200/75,198
(78.7)
28,605/38,199
(74.9)
    Prevention 8,092/75,778
(10.7)
8,092/75,198
(10.8)
4,152/38,199
(10.9)
    Diagnostic 2,655/75,778
(3.5)
2,655/75,198
(3.5)
1,489/38,199
(3.9)
    Supportive care 1,847/75,778
(2.4)
1,847/75,198
(2.5)
1,290/38,199
(3.4)
    Screening 866/75,778
(1.1)
286/75,198
(0.4)
195/38,199
(0.5)
    Health services research 900/75,778
(1.2)
900/75,198
(1.2)
733/38,199
(1.9)
    Basic science 1,882/75,778
(2.5)
1,882/75,198
(2.5)
1,735/38,199
(4.5)
    Educational/counseling/ training 336/75,778
(0.4)
336/75,198
(0.4)
    Primary purpose missing 20,568/96,346
(21.3)
4,215/79,413
(5.3)
2,771/40,970
(6.8)
Type of intervention, n/N (%)      
    Drug 53,441/84,614
(63.2)
52,162/79,410
(65.7)
24,751/40,970
(60.4)
    Procedural 10,911/84,614
(12.9)
9,635/79,410
(12.1)
4,104/40,970
(10.0)
    Biological 6,841/84,614
(8.1)
6,657/79,410
(8.4)
2,948/40,970
(7.2)
    Behavioral 7,134/84,614
(8.4)
6,582/79,410
(8.3)
3,307/40,970
(8.1)
    Device 6,662/84,614
(7.9)
6,012/79,410
(7.6)
3,799/40,970
(9.3)
    Radiation 2,361/84,614
(2.8)
2,292/79,410
(2.9)
928/40,970
(2.3)
    Dietary supplement 2,067/84,614
(2.4)
2,036/79,410
(2.6)
1,603/40,970
(3.9)
    Genetic 1,096/84,614
(1.3)
712/79,410
(0.9)
381/40,970
(0.9)
    Other 8,211/84,614
(9.7)
6,625/79,410
(8.3)
5,110/40,970
(12.5)


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