Table 2.

Reasons for petition signing (top-down theme coding and topic-modeling (LDA) methods).

Top-down theme coding
Theme	N (%) *
Advocates for the research	560 (50.9%)
Ketogenic diet helped someone the commenter knew	187 (17.0%)
Ketogenic diet helped the commenter	148 (13.4%)
Administrative roadblocks and conflicts of interest	116 (10.5%)
Topic-modeling results (LDA)
Theme
Support for ketogenic diet research in broader science and disease
Diet and food believed to help symptoms and conditions
People are suffering with current pharmacologic treatments
Mental health improves with ketogenic diet intervention
Living with schizophrenia
Studies are needed to determine [ketogenic diet] treatment effect

*May not equal 100% due to uncharacterized comments and comments in more than one category.