A color-coded urgency bar and intervention thresholds in sequential health decisions

Delayed help-seeking is often viewed as a failure to recognize warning signs. However, health decisions are not simple recognition tasks: early symptoms may be ambiguous, warning signs accumulate over time, and individuals must decide when the available evidence becomes sufficient to justify action. This study examined whether different presentations of escalating health-risk information were associated with when people chose to seek help during hypothetical sequential decision tasks. Two hundred and seventy-seven participants completed four scenarios in which they repeatedly chose either to continue monitoring or to seek help as symptoms accumulated. Six information formats were compared: symptoms alone; symptoms with a numerical urgency score, urgency label, visual bar, or color-coded bar; and a multimodal display combining symptoms, score, label, and color. Author-generated urgency scores were used solely to construct internally ordered escalation trajectories and have no external clinical interpretation. Of 1,108 scenario sequences, 25 ambiguous sequences were excluded, leaving 1,083 analyzable scenarios and 3,047 stage-level at-risk decisions. A participant-clustered logistic generalized estimating equation model adjusted for experimental urgency, trajectory, and scenario pair. Compared with symptoms alone, the tested green-yellow-orange-red urgency bar was associated with higher odds of intervention (OR = 2.06, 95% CI 1.52–2.80), and it also exceeded the otherwise identical non-colored visual bar (OR = 1.70, 95% CI 1.26–2.28; Holm-adjusted p = .0027). The multimodal display did not differ from symptoms alone (OR = 0.99, 95% CI 0.72–1.37), and the colored-bar association remained in a score-independent sensitivity analysis. These findings suggest that behavioral intervention thresholds depend not only on the amount of information presented but also on how that information is organized and communicated. Within this sequential vignette task, the tested color-coded urgency bar was associated with earlier intervention than simpler or denser alternatives, supporting the importance of interface design in communicating escalating health risk. These findings do not establish clinical benefit or generalize beyond the specific palette, interface, and hypothetical scenarios studied.