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Table 1 Baseline characteristics stratified by body mass index

From: Association between the body mass index and outcomes of patients resuscitated from out-of-hospital cardiac arrest: a prospective multicentre registry study

Variables Total
(n = 605)
Underweight group
(n = 75)
Normal group
(n = 333)
Overweight group
(n = 163)
Obese group
(n = 34)
p-value*
Patient domain
 Age, years, median (IQR) 63 (53–74) 71 (62–79) 63 (54–75) 61 (51–72) 56.5 (42–72) <.001
 Sex, male (%) 422 (69.75) 53 (70.67) 233 (69.97) 115 (70.55) 21 (61.76) 0.774
 Witnessed arrest (%) 449 (74.21) 55 (73.33) 244 (73.27) 125 (76.69) 25 (73.53) 0.870
 Arrest location (n = 601)
  Home/residence (%) 320 (53.24) 48 (64) 172 (52.12) 85 (52.47) 15 (44.12) 0.185
  Other (%) 281 (46.76) 27 (36) 158 (47.88) 77 (47.53) 19 (55.88)
 Bystander response (n = 602)
  CPR by bystander (%) 307 (51) 39 (52.7) 164 (49.4) 84 (51.53) 20 (60.61) 0.645
  No CPR by bystander (%) 295 (49) 35 (47.3) 168 (50.6) 79 (48.47) 13 (39.39)
 First monitored rhythm (n = 597)
  Shockable rhythm (%) 250 (41.88) 11 (14.86) 149 (45.29) 72 (45) 18 (52.94) <.001
  Non-shockable rhythm (%) 347 (58.12) 63 (85.14) 180 (54.71) 88 (55) 16 (47.06)
Comorbidities (n = 603)
 Hypertension (%) 294 (48.76) 31 (41.33) 153 (46.08) 93 (57.41) 17 (50) 0.058
 Diabetes (%) 190 (31.51) 16 (21.33) 102 (30.72) 60 (37.04) 12 (35.29) 0.102
 Dyslipidaemia (%) 40 (6.63) 2 (2.67) 22 (6.63) 12 (7.41) 4 (11.76) 0.320
Pre-ROSC process domain
 No flow time, minutes, median (IQR) 7 (5–10) 6 (3–10) 7 (5–11) 7 (5–10) 6 (5–10) 0.446
 Low flow time, minutes, median (IQR) (n = 604) 25 (12–40) 26 (18–38) 24.5 (11–39) 25 (11–42) 24.5 (15–54) 0.655
 Pre-hospital ROSC (%) 206 (34.05) 15 (20) 129 (38.74) 51 (31.29) 11 (32.35) 0.015
 Pre-hospital adrenaline use (%) 62 (10.25) 5 (6.67) 39 (11.71) 16 (9.82) 2 (5.88) 0.465
 Pre-hospital airway
  Bag-valve mask (%) 234 (38.68) 34 (45.33) 120 (36.04) 66 (40.49) 14 (41.18) 0.427
  Supraglottic airway (%) 300 (49.59) 29 (38.67) 173 (51.95) 82 (50.31) 16 (47.06)
  Endotracheal intubation (%) 71 (11.74) 12 (16) 40 (12.01) 15 (9.2) 4 (11.76)
Post-ROSC process domain
 Mental state at admission
  Alert (%) 60 (9.92) 4 (5.33) 33 (9.91) 20 (12.27) 3 (8.82) 0.333
  Drowsy to stuporous (%) 63 (10.41) 6 (8) 30 (9.01) 22 (13.5) 5 (14.71)
  Coma (%) 482 (79.67) 65 (86.67) 270 (81.08) 121 (74.23) 26 (76.47)
 Reperfusion attempted
  None (%) 297 (49.09) 52 (69.33) 164 (49.25) 68 (41.72) 13 (38.24) 0.002
  CAG only (%) 170 (28.1) 10 (13.33) 93 (27.93) 54 (33.13) 13 (38.24)
  CAG and PCI (%) 96 (15.87) 6 (8) 60 (18.02) 26 (15.95) 4 (11.76)
  tPA (%) 42 (6.94) 7 (9.33) 16 (4.8) 15 (9.2) 4 (11.76)
 TTM (%) 225 (37.19) 17 (22.67) 122 (36.64) 72 (44.17) 14 (41.18) 0.015
 pH, median (IQR) (n = 600) 7.07 (6.92–7.25) 7.06 (6.95–7.27) 7.11 (6.91–7.27) 7.03 (6.9–7.22) 7.11 (6.98–7.28) 0.212
 Lactate, mmol/l, median (IQR) (n = 593) 10.6 (7.6–14) 11.7 (9–14.39) 10.285 (7.2–13.2) 11 (8.2–15.29) 9.4 (6.5–13.2) 0.008
 Glucose, mg/dl, median (IQR) (n = 603) 265 (193–338) 229 (146–313) 268 (207–335) 265 (190–378) 268.5 (228–362) 0.039
 First systolic BP after ROSC, mmHg, median (IQR) (n = 590) 122.5 (92–152) 130 (80–149) 120 (90–149) 124.5 (95.5–160) 121 (98–156) 0.482
 First diastolic BP after ROSC, mmHg, median (IQR) (n = 589) 75 (59–93) 79 (56–93) 74 (56–91) 77 (60–96) 72 (57–90) 0.428
 First pulse rate after ROSC, beats/min, median (IQR) (n = 586) 100 (81–123) 99 (75–132) 96 (79–120) 108 (87–124) 102 (78–116) 0.062
  1. Abbreviations: IQR interquartile range, CAG coronary angiography, CPR cardiopulmonary resuscitation, PCI percutaneous coronary intervention, ROSC return of spontaneous circulation, tPA tissue plasminogen activator, TTM targeted temperature management
  2. Continuous variables are presented as the median (Q1, Q3) and tested by using the Kruskal-Wallis test, and categorical variables are presented as N (%) and tested by using the chi-squared test
  3. *p < 0.05 was significant