highly significantP < 0.0001
For the SIADH/cancer subgroup, subjects on tolvaptan exhibited a highly significant improvement in this parameter ( P < 0.0001) relative to placebo to day 4 (5.0 vs. −0.3 mEq/mL) and to day 30 (6.9 vs. 1.0 mEq/L) (Fig. 2 ).