In the case list screen it is often useful to display the history of a tracked value like patient weight or blood pressure. This can be done by following the Incrementing a counter trick, but using a string concatenation instead of an increment:

In the calculate condition for "new_weight_history", you use the concat function to add the answer to the weight question to the weight_history: concat(#case/weight_history, #form/weight, '-'). The final dash is a separator that ensures the weight history can be easily read.



The output of this would be "55 - 56 - 58 - " and would continue to track the additions.