Supplementary material for: Sociodemographic, clinical, lifestyle and psychological correlates of peripheral neuropathy among 2–12-year colorectal cancer survivors

Background
Peripheral neuropathy (PN) is a debilitating complication among colorectal cancer (CRC) survivors that can become chronic. No large-scale study has yet analyzed correlates in multivariable models. We did multivariable analyses to find correlates of PN.

Methods
In 1,516 all-stage Dutch CRC survivors, cross-sectional data were collected on sensory, motor, autonomic and total PN, sociodemographic (age, sex, education, employment, partner), clinical (time since diagnosis, tumor location, stage, chemotherapy, radiotherapy, co-morbidities), lifestyle (alcohol, smoking, physical activity, body mass index), psychological factors (anxiety, depression, personality) and health-related quality of life (HRQoL). After multiple imputation, correlates were analyzed with linear regressions and eliminated with backwards selection.

Results
CRC survivors (69 years; 42% female) were on average five years post-diagnosis, and 28-65% reported PN. PN was associated with older age, being male (sensory) or female (motor), shorter time since diagnosis, chemotherapy, co-morbidities, anxiety, depression, and worse scores on HRQoL domains, and pain, nausea, vomiting, insomnia, constipation and financial problems.

Conclusions
In multivariable analyses, PN is affected by receiving chemotherapy, aging, sex, co-morbidities, stress-related factors and HRQoL in CRC survivors. Future PN-related studies can include these factors, and they can be examined in longitudinal studies to gain more knowledge about chronicity and severity of PN.