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374 - Farm Hosp. 2016;40(5):371-384 Rosario Santolaya-Perrín et al.
Patients were randomly assigned to the control arm
and the intervention arm. There was complete randomization
by hospital and by intervention arm. The coordinating
centre generated a table of random numbers
for each centre, and was in charge of safe-keeping the
randomization list for each centre. Researchers received
closed envelopes. Patient selection was consecutive. The
researcher opened the randomization envelope only after
the patient had signed the Informed Consent Form.
Statistical analysis
The analysis of variables was conducted using the
Chi-Square Test for categorical variables, Student’s t Test
for continuous variables that followed a normal distribution,
and Mann-Whitney’s U Test for those variables that
did not follow the normal distribution. The mean and its
typical deviation were estimated, as well as the median
and its interquartile range, or the absolute and relative
frequencies, as relevant.
For the statistical analysis of data, the SPSS statistical
package version 18.0 was used (SPSS Inc, Chicago, IL,
USA). P