A randomized controlled trial (or randomized control trial RCT) is a type of scientific (often medical) experiment, where the people being studied are randomly allocated one or other of the different treatments under study.

At least one study has demonstrated that this modality is more effective than artificial tears in a randomized control study.

For example, many trials did not describe their method of measuring statistical relevance, and only called themselves randomized controlled trials.

What is agreed is the need for randomized controlled trials of the long term effects of repeated use of paracetamol in children.

And in the 20th century, randomized, controlled trials have revolutionized medicine by allowing us to distinguish between drugs that work and drugs that don't work.

There is now strong evidence from three randomized controlled trials undertaken (..) that male circumcision reduces the risk of heterosexually acquired HIV infection in men by approximately 60 .

An extremely well controlled study is Saikia Mohanty's (2004) study of indigenous tribal Bodo children in Assam, India.

But service delivery remained disappointing, so the focus shifted to improving project performance, which researchers like Esther Duflo at MIT s Poverty Action Lab have pioneered with randomized controlled experiments.

For example, recent work with field experiments and randomized controlled trials (RCTs), which has caught on like wildfire among development economists, lies strictly in the tradition of bottom up development.

I'm not even telling you the story because I think we should be running more carefully controlled randomized trials in all aspects of public policy, although I think that would also be completely awesome.

What is agreed is the need for randomized controlled trials of the long term effects of repeated use of paracetamol in children. Only then will it be possible to develop evidence based guidelines for its recommended use.

The only randomized clinical trial to demonstrate a benefit for lutein in macular degeneration was a small study, in which the authors concluded that visual function is improved with lutein alone or lutein together with other nutrients and also that more study was needed.

A randomized controlled trial found that amitriptyline 25 mg per night for 90 days starting within two days of onset of rash can reduce the incidence of postherpetic neuralgia from 35 to 16 (number needed to treat is 6).

A recent study conducted in China, including 862 patients who were between the second and tenth day after onset of acute stroke, is the largest truly randomized trial using death or dependency as the primary outcome.

Three randomized clinical trials were conducted in Kenya, Uganda and South Africa.

Second, and perhaps more importantly, the Mexicans implemented the methodological idea of conducting controlled experiments to find out which policies work and which don t work in developing countries (which has fed into the exciting Randomized Control Trials movement in the field of development economics).

The controversy stems from the kind of evidence that is used. Sackett implies, but does not stipulate, that epidemiological evidence (findings from randomized controlled trials and large cohort studies carried out over many years) should underpin doctors decisions about patients and, one hopes, in consultation with them.

None of them used randomized control experiments to design their social or economic programs.

Learning requires some degree of extrapolation, converting randomized evaluations from hard evidence into soft evidence.

Unfortunately, when investigators undertook randomized trials, they found that treated patients had a higher death rate.

(a) Controlled delivery?

Development economists, for their part, argued that much more attention would be paid to randomized trials and field experiments.

Many approaches to the problem have been explored, including greedy algorithms, randomized search, genetic algorithms and A search algorithm.

In the first controlled study, researchers reported a 50 decline in symptoms of depression within two hours of a ketamine infusion, and one third of patients were virtually symptom free within a day.

State controlled banks allocate capital.

State holding companies controlled key listed firms directly and associations controlled the rest, reconciling totalitarianism with nominally private ownership.

Macro development economists need to recognize the advantages of the experimental approach and adopt the policy mindset of enthusiasts of randomized evaluation.

Task cannot be monitored or controlled

It controlled one or more gateways.

In tennis, player movement is controlled by the Wii, while the swinging of the racket is controlled by the player.

Conduct directed or controlled by a State

The idea of Europe controlled my mind.

Review of controlled sources of ionizing radiation

The valley was a Palestinian controlled area.

(f) The Parties may consider carrying out a study of cases of illegal trade and efforts made in connection with other international regimes dealing with the management of controlled chemicals and consider the lessons learned under those regimes

The UK has the powers to control the transhipment of controlled goods and, in respect of WMD, non controlled goods through the UK.

Controlled substance a substance the use of which is controlled for health or environmental reasons, pursuant to a declaration by the competent body

They had gotten their chemotherapy, and then they randomized them, where half got placebo, and half got a drug called Zoledronic acid that builds bone.

In this way the number of chromosomes will be halved in each cell, while all the parts on the chromosome (genes) remain, after being randomized.

That is why it is a controlled substance.

Treasury Secretary John Connolly attacked Japan s controlled economy.

They shouldn t be controlled by instinct and fantasy.

After all, if you walk along Tel Aviv s beaches, the dramas of Hamas controlled Gaza and Hezbollah controlled southern Lebanon seem so far away.

Another register controlled the period of a pseudo random noise generator, while another controlled the mixing of this noise into the three primary channels.

Patrolling of the Abkhaz controlled lower Kodori valley was carried out, but patrolling of the Georgian controlled upper Kodori valley remained suspended for security reasons.