Table 5 Negative control for parallel trends - comparing the periods 3 − 2 months and 2 − 1 months before infection
From: Impact of Long-COVID in children: a large cohort study
Proportion in COVID-19 diagnosed group 3 − 2 (2 − 1) month before index date | Proportion in control group 3 − 2 (2 − 1) month before index date | p-value | Relative-Risk (CI) | |
|---|---|---|---|---|
Primary Physician Visits | 0·202 (0·202) | 0·179 (0·180) | 0·04 | 0·98 (0·96, 1·00) |
Specialty Physician Visits | 0·064 (0·066) | 0·057 (0·059) | 0·26 | 1·02 (0·98, 1·07) |
ER Visits | 0·009 (0·009) | 0·008 (0·008) | 0·91 | 1·01 (0·90, 1·13) |
Hospital Admissions | 0·003 (0·003) | 0·002 (0·003) | 0·77 | 1·04 (0·85, 1·29) |
Prescriptions | 0·123 (0·123) | 0·108 (0·110) | 0·03 | 0·97 (0·94, 1·00) |
New Diagnoses | 0·005 (0·005) | 0·004 (0·005) | 0·48 | 1·06 (0·91, 1·24) |
Referrals for Mental Health Services | 0·001 (0·001) | 0·001 (0·001) | 0·40 | 0·87 (0·59, 1·22) |