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Table 1 Characteristics of the study sample according to symptomatic SARS-COV-2 reinfection status, Mexico 2020

From: Symptomatic SARS-COV-2 reinfection: healthcare workers and immunosuppressed individuals at high risk

  Overall SARS-COV-2 reinfection p
  No Yes
  n = 99,993 n = 99,783 n = 210
Gender
 Female 50,916 (50.9) 50,805 (50.9) 111 (52.9) 0.574
 Male 49,077 (49.1) 48,978 (49.1) 99 (47.1)  
Age (mean ± SD, years) 42.2 ± 13.1 42.2 ± 13.1 39.2 ± 10.4  < 0.001
 Age group (years)
  20–49 73,069 (73.1) 72,888 (73.1) 181 (86.2)  < 0.001
  50–59 16,755 (16.8) 16,735 (16.7) 20 (9.5)  
  60–69 6644 (6.6) 6638 (6.7) 6 (2.9)  
  70 +  3525 (3.5) 3522 (3.5) 3 (1.4)  
Occupation
 Housewife 10,685 (10.7) 10,679 (10.7) 6 (2.9)  < 0.001
 Healthcare worker 10,183 (10.2) 10,151 (10.2) 32 (15.2)  
 Other healthcare-related 22,303 (22.3) 22,195 (22.2) 108 (51.4)  
 Student 919 (0.9) 919 (0.9) 0 (0)  
 Other 55,903 (55.9) 55,839 (56.0) 64 (30.5)  
Disease severity (at primary infection) a
 Mild-moderate 81,018 (81.0) 80,827 (81.0) 191 (91.0)  < 0.001
 Severe 18,975 (19.0) 18,956 (19.0) 19 (9.0)  
Personal history of:
 Obesity (BMI 30 or higher)
  No 81,531 (81.5) 81,353 (81.5) 178 (84.8) 0.228
  Yes 18,462 (18.5) 18,430 (18.5) 32 (15.2)  
 Type 2 diabetes mellitus
  No 86,909 (86.9) 86,718 (86.9) 191 (91.0) 0.082
  Yes 13,084 (13.1) 13,065 (13.1) 19 (9.0)  
 Arterial hypertension
  No 82,167 (82.2) 81,991 (82.2) 176 (83.8) 0.535
  Yes 17,826 (17.8) 17,792 (17.8) 34 (16.2)  
 Immunosuppressionb
  No 98,830 (98.8) 98,627 (98.8) 203 (96.7) 0.003
  Yes 1163 (1.2) 1156 (1.2) 7 (3.3)  
 Chronic kidney disease
  No 98,440 (98.5) 98,239 (98.5) 201 (95.7) 0.001
  Yes 1553 (1.5) 1544 (1.5) 9 (4.3)  
 Chronic obstructive pulmonary disease
  No 98,872 (98.9) 98,667 (98.9) 205 (97.6) 0.083
  Yes 1121 (1.1) 1116 (1.1) 5 (2.4)  
 Asthma
  No 96,906 (96.9) 96,705 (96.9) 201 (95.7) 0.315
  Yes 3087 (3.1) 3078 (3.1) 9 (4.3)  
 Cancer (any site)
  No 99,744 (99.7) 99,535 (99.7) 209 (99.5) 0.508
  Yes 249 (0.3) 248 (0.3) 1 (0.5)  
  1. SARS-COV-2 Severe acute respiratory coronavirus 2, SD Standard deviation, BMI Body mass index
  2. 1) The absolute and relative (%) frequencies are presented, except if the mean is specified; 2) p-value from chi-square or t-tests are presented as corresponding.
  3. aSevere illness included the register of dyspnea requiring hospital admission.
  4. bImmunosuppression referred to any cause of the related deficiency except for type 2 diabetes mellitus or renal impairment.