From:  A brief, comprehensive measure of post-exertional malaise

 Onset delay of PEM symptoms.

Delay% (n)
No delay10.0 (154)
1 hour or less2.0 (30)
2–23 hours31.9 (490)
1–2 days39.0 (599)
3 days or more17.0 (261)

Note. Question 4ʼs data is presented in Table 3, which depicts options provided in the original questionnaire.