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Table 1 Demographic and clinical characteristics of patients enrolled for severe respiratory and influenza-like illness surveillance and asymptomatic controls, South Africa, June 2012 – May 2016 (N = 12,922)

From: Challenges and clinical relevance of molecular detection of Bordetella pertussis in South Africa

Characteristic Surveillance population
SRI n/N (%) N = 5634 ILI n/N (%) N = 4933 Controls n/N (%) N = 2355
Gender
 Male 2861/5626 (51) 1757/4733 (37) 774/2291 (34)
 Female 2765/5626 (49) 2976/4733 (63) 1517/2291 (66)
Race
 Black 5473/5604 (98) 4723/4728 (100) 2287/2292 (100)
 Non-black 131/5604 (2) 5/4728 (0) 5/2292 (0)
Age group (years)
  < 1 1307/5618 (23) 599/4921 (12) 323/2352 (14)
 1–4 764/5618 (14) 1019/4921 (21) 464/2352 (20)
 5–14 168/5618 (3) 727/4921 (15) 520/2352 (22)
 15–24 276/5618 (5) 649/4921 (13) 191/2352 (8)
 25–44 1756/5618 (31) 1388/4921 (28) 371/2352 (16)
 45–64 1051/5618 (19) 460/4921 (9) 337/2352 (14)
  ≥ 65 296/5618 (5) 79/4921 (2) 146/2352 (6)
Underlying illness*
 No 5023/5627 (89) 4484/4723 (95) 2172/2290 (95)
 Yes 604/5627 (11) 239/4723 (5) 118/2290 (5)
HIV status
 Uninfected 2577/5308 (49) 3253/4451 (73) 1314/2263 (58)
 Infected 2731/5308 (51) 1198/4451 (27) 949/2263 (42)
Hospital/Clinic
 Edendale 2507/5634 (45) N/A N/A
 KTHC 3127/5634 (56) N/A N/A
 Edendale Gateway N/A 3655/4933 (74) 1041/2355 (44)
 Jouberton Clinic N/A 1278/4933 (26) 1314/2355 (56)
  1. SRI = Severe respiratory illness; ILI = Influenza-like illness; N/A = Not applicable; KTHC = Klerksdorp Tshepong hospital complex
  2. *Patients with previously diagnosed chronic conditions including asthma, chronic lung diseases, cirrhosis/liver failure, chronic renal failure, heart failure, valvular heart disease, coronary heart disease, immunosuppressive therapy, splenectomy, diabetes, burns, kwashiorkor/marasmus, nephrotic syndrome, spinal cord injury, seizure disorder, emphysema, or cancer. All percentages are rounded off