64 CHAPTER 3 Figure 3. Variables on self-reported health, wellbeing and lifestyle added to the RF-model with solely routinely collected data. The vertical lines show the average F1-measures. Results based on analyses among study population of 4172 women Variable importance Figure 4 shows the variable importance of all 42 variables. Top seven predictors for multidimensional vulnerability during pregnancy were: ‘socioeconomic position (occupationalstatus)’, ‘perceived health status’, ‘restricted by health’, ‘permanent employment contract’, ‘medication use’, ‘long-term illness’ and ‘total healthcare expenditures’. Out of these seven variables, which represent both risk and protective factors, three concern self-reported health, two concern socioeconomic characteristics and two relate to healthcare expenditures and utilization. Related to financial status, self-reported ‘insufficient financial resources’ was ranked higher compared to the routinely collected ‘household income’ and ‘depts and payment arrears’. Likewise, self-reported ‘perceived health status’ and ‘feeling restricted by health’ was ranked higher than ‘medication use’ and ‘total healthcare expenditures’. We found the opposite for psychological characteristics: routinely collected ‘mental healthcare utilization’ was ranked higher than self-reported ‘risk of depression or anxiety disorders’ or ‘loneliness’. However, differences were small.
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