Table 2

Demographic characteristics of enrolled children (n=310)*

Demographic parametersChildren who completed study at 3 years of age (N=225)Children did not complete study at 3 years of age† (N=85)P-value
Boys125 (55.6)45 (52.9)0.7
Anthropometry, mean (SD)
At birth
 Weight (kg)2.8 (0.3)2.8 (0.3)0.9
 Length (cm)48.3 (1.7)48.2 (1.6)0.6
At 3 years
 Weight (kg)12.9 (1.7)13.3 (1.9)0.3
 Height (cm)91.3 (7.1)91.9 (3.9)0.8
Mode of delivery
 Vaginal152 (67)56 (65.8)0.3
 Caesarean section73 (33)29 (34.2)
History of smoking at home78 (34.6)18 (21.1)0.2
History of pet at home23 (10.2)14 (16.4)0.3
Place of residence
 Urban190 (84.4)81 (95.3)0.05
 Rural35 (15.6)4 (4.7)
Family history of allergy
 Asthma63 (28)20 (23)0.4
 Allergic rhinitis72 (32)26 (30)0.1
 Atopic dermatitis21 (9.3)11 (12.9)0.3
  • *Values are expressed in n (%) unless otherwise specified.

  • †Children who were excluded, lost to follow-up and unable to perform all IPFT manoeuvres.

  • IPFT, infant pulmonary function test.