Numbers are described by words in the beginning of a sentence.
When they are preceded by a word such as a preposition, a conjunction, etc., they can be expressed by numbers.
Twenty-five of 30 patients were... / Fifty patients showed...
In 25 patients, ... / While 50 patients...
---
例の「（後ろの単語を形容する）1-10は文字表記」のスタイルは、著者次第の傾向にありますが、patientsの前の数字がこれに沿っていることがあると伝統的で美しくも思えました。
★─☆｡oﾟ｡★─☆｡oﾟ｡
Anastasiia Gubanova - SP (2016-2017 season)
For Rika Kihira's FS, I have no idea how come they selected this music.