From the paper:

來源: 虎嗅薔薇 於 2020-03-30 12:07:47 [] [舊帖] [給我悄悄話] 閱讀數 : (377 bytes)
本帖於 2020-03-30 12:09:47 時間, 由普通用戶 虎嗅薔薇 編輯

" because NPIs were not evaluated quantitatively, but only qualitatively, the rates of implementation may be inaccurate."

Data collected from recall questionaire, which can be highly unreliable.

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