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Table 1 Participant characteristics prior to the COVID-19 pandemic

From: Impact of the COVID-19 pandemic on symptoms of anxiety and depression and health-related quality of life in older patients with chronic kidney disease

Participant characteristics (n = 82) Prior COVID-19 pandemic
Age, median (IQR) 77.5 (73.9–82.1)
Sex, male (%) 63 (76.8)
Living/marital statusa
 Living together with partner / married 52 (63.4)
 Living alone / widow 29 (35.4)
Missing 1 (1.2)
Level of education (%)a
 Low (none, primary, secondary education) 51 (62.2)
 High (vocational, higher secondary, tertiary) 29 (35.4)
Missing 2 (2.4)
Clinical frailty scale, mean (SD)a 3.6 (1.3)
 Non-frail (score 1–3) 43 (52.4)
 Vulnerable or mildly frail (score 4–5) 32 (39.0)
 Moderately or severely frail (score 6–7) 7 (8.5)
Charlson comorbidity index, median (IQR)a 4.0 (3.0–5.0)
 CCI score 2-3b 31 (37.8)
 CCI score ≥ 4 48 (58.5)
Missing 3 (3.7)
eGFR, if not on dialysis, mean (SD) 15.7 (4.3)
Started kidney replacement therapy
 Haemodialysis 2 (2.4)c
 Peritoneal dialysis 0 (0.0)
  1. The following continuous variables had missing data: eGFR at baseline (2.4%)
  2. aThese demographic and clinical characteristics were not reassessed during COVID-19 pandemic
  3. bAll patients scored minimum 2-points for moderate to severe kidney disease
  4. cTwo patients were already on haemodialysis treatment when having the follow-up measurement of POLDER study, which has been used as reference for outcomes before COVID-19 pandemic for the current study