14. Repeating/studying Fiqh with a study-group that would be lost by leaving. The commentary specifically says this is Fiqh, not an unrestricted excuse for every language or grammar study, and it should not become a habitual way to abandon congregation.
15. Desired food is present and would seriously distract the person.
16. Intention/preparation to travel where leaving for congregation risks losing the prepared departure.
17. Caring for a sick person who would suffer hardship/distress because of the caregiver's absence.
18. Severe wind at night — not daytime wind under this specific rule.
The commentary treats urgent bodily pressure, such as strongly needing the toilet, as analogous to the distraction caused by desired food; it is not a nineteenth item in the author's count.