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Table 1 Characteristics of the index cases and household contacts

From: A prospective longitudinal study of tuberculosis among household contacts of smear-positive tuberculosis cases in Lima, Peru

Characteristic

N (%)a

Index case

 

 Male sex

481 (40.0)

 Age (median, IQR) in years

26 (21–35)

 Presence of cough

1135 (96.4)

 Time from symptoms to treatment initiation (in days)

33 (19–62)

 Smear positivity

 

  Scanty

40 (3.4)

  +/++

562 (47.7)

  +++

576 (48.9)

 Treatment

 

  For drug susceptible TB

1162 (98.6)

  For MDR TB

16 (1.4)

 Tobacco use

 

  None

713 (60.7)

 

416 (35.4)

 

46 (3.9)

 HIV

 

  Positive

884 (75.0)

  Negative

18 (1.5)

  Not tested

276 (23.4)

Household characteristics

 

 Past TB episodes

62 (5.3)

 Recent TB episodes

29 (2.5)

 Persons per room

2.1 (1.5–3.0)

Household contact characteristics (n = 5466)

 

 Male sex

2674 (48.9)

 Age (median, IQR) in years

24 (12–40)

 Relationship with the index case

 

  Sibling

1416 (25.9)

  Parent

946 (17.3)

  Partner

437 (7.9)

  Offspring

1031 (19.9)

  Other

1636 (29.9)

  1. a frequencies are presented in absolute number and percentages, except for continuous variables where the median and the interquartile range (IQR) is presented. TB tuberculosis, MDR TB multi drug resistant TB
  2. For smear positivity: scanty = 1–9 acid fast bacilli (AFB) in 100 fields, +/++ = from 10 AFB in 100 fields to 10 AFB per field in at least 50 fields, +++ = more than 10 acid fast bacilli in at least 20 fields. A TB episode in a HHC more than two years before the diagnosis of the index case, d = a TB episode within two years before the index case diagnosis