Sentences with phrase «of opaque envelopes»
The treatment assignment sequence was masked to the investigator with the use of opaque envelopes.
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Quote: «A biostatistician prepared a set of opaque envelopes, each labelled with a subject ID number and containing a group assignment.
Not exact matches
low risk of bias (e.g. telephone or central randomisation; consecutively numbered sealed opaque envelopes);
Paper stated «Women were asked to select an envelope from a group of at least 6 sealed, opaque envelopes, replenished in blocks of 12.
Next we modelled our high performance envelope scenario to see what would be required for compliance if using a boiler and found that near passive house levels of insulation and airtightness would be needed for all three house types, with U-values of 0.13 for opaque elements, 1.2 for windows and doors and an airtightness of 1.0 m3 / h / m2).
Group affiliation and study number were noted on a piece of paper and placed in a set of identical opaque envelopes by the first author (FO).
After consent and the collection of baseline data, randomisation was undertaken using sequentially numbered sealed opaque envelopes (fig 1).