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| Trial Controllato Randomizzato a Blocchi× | Trial Controllato Randomizzato Cross-over× | |
|---|---|---|
| Campo | Disegno sperimentale | Disegno sperimentale |
| Famiglia | Process / pipeline | Process / pipeline |
| Anno di origine≠ | 1920s (Fisher's blocking principle); applied to RCTs from the 1940s onward | 1960s (Grizzle 1965 for statistical foundations); widely used in clinical research since the 1970s |
| Ideatore≠ | R. A. Fisher (blocking principle); systematic RCT application by Bradford Hill and later Pocock, Friedman et al. | Early formalized by statisticians including Bradford Hill and colleagues in clinical trials; theoretical framework developed by Grizzle (1965) and later Senn (2002) |
| Tipo≠ | Experimental design | Experimental within-subject design |
| Fonte seminale≠ | Friedman, L. M., Furberg, C. D., DeMets, D. L., Reboussin, D. M., & Granger, C. B. (2010). Fundamentals of Clinical Trials (4th ed.). Springer. ISBN: 978-1441915856 | Senn, S. (2002). Cross-over Trials in Clinical Research (2nd ed.). Wiley. ISBN: 978-0471496533 |
| Alias | blocked RCT, block-randomized trial, stratified block randomization trial, permuted block randomization | crossover RCT, crossover trial, within-subject RCT, AB/BA crossover design |
| Correlati | 5 | 5 |
| Sintesi≠ | A blocked randomized controlled trial (blocked RCT) uses permuted-block randomization to ensure that treatment groups remain balanced in size — and optionally in key characteristics — throughout recruitment. Within each block of fixed or randomly varied size, all treatment allocations are present in equal numbers, so imbalance cannot accumulate even if the trial is stopped early. This makes blocked RCTs the standard randomization approach in clinical and behavioral intervention research. | A crossover randomized controlled trial (crossover RCT) is an experimental design in which each participant receives all study interventions in a randomized sequence, separated by a washout period. Because every participant serves as their own control, within-subject variability is eliminated from the treatment comparison, yielding greater statistical power per participant than a parallel-group RCT of equal size. |
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