Effects on process indicators
Compared with PR, fewer participants with NR stated that the meals were bland during the whole intervention period (odds ratio 0.46; 95%CI 0.29 to 0.73; Self-reported feel of food saltiness among study participants with PR versus NR. Among participants who completed the questionnaire at baseline and at least one follow-up visit (Further analysis showed that those who reported food as bland tended to be more likely to add out-of-study salt in their meals (Additional file Mean 24-h urinary sodium excretion was not significantly reduced (− 8.4 mmol; 95%CI =  − 21.8 to 4.9 mmHg, 