You can easily create a drop-down list in Excel to limit the values that can be entered in a column. Here's how to set one up ...

To create data bars in Excel, select your cells and then choose data bars from Conditional Formatting.

cDepartment of Maternal, Newborn, Child and Adolescent Health, and Ageing, Imperial College London, London, UK dDepartment of Epidemiology and Biostatistics, Imperial College London, London, UK ...