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While the average blood pressure was around 9/5 mmHg lower on the low- salt diet, some of the nineteen patients apparently had no significant benefit, and two patients actually experienced slight increases in blood pressure with salt restriction. Importantly, based on twenty- four- hour urinary potassium levels, the intake of potassium in the trial was low (around 2.2 to 2.5 grams per day, or about half the recommended intake of 4.7 grams of potassium per day).

--- Does the bolded sentence simply mean: They [researchers] concluded, based on twenty-four-hour urinary potassium levels that the intake of potassium in the trial was low.

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Yes, that's how I interpret it too.