2.2 | Randomization
Before randomization, both written and verbal information was provided
to the parents and their consent was obtained. Then the random number
corresponding to the number of the research object was generated in the
process of SAS9.4procplan. Based on the parity of the random number, the
research object was randomly divided into the CIV and IIV groups. Each
research object was assigned to the corresponding group using a table
randomly numbered in the order of admission to the
ICU.