MIMIC-IV 2.2: Question about "uo_rt_6hr"

[vasilissoti]

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Hello my questions is based on MIMIC-IV, version 2.2:

May I ask what is the "uo_rt_6hr" column located in the module "derived" within the table "kdigo_uo"? Is this the urine output rate calculated for the urine_output_6hr based on the weight? If yes why there is a small discrepancy between the actual calculation and the rate value stored and there are rows that have both weight and a urine_output_6hr values available but not a uo_rt_6hr value?

Thank you for your time and help.