TABLE 2.

Description of participants according to existing missing data on laboratory diagnosis of pertussis infection

CharacteristicValue for groupP value
Missing-data groupLaboratory complete-data group
Total participants148218
Clinical symptoms present, % (no.)72.3 (107)60.1 (131)0.03
Sex distribution, % (no.)0.02
    Men52.0 (77)39.0 (85)
    Women48.0 (71)61.0 (133)
Age (median), yrs15.527.0
Age (2 classes), % (no.)0.0001
    Adults, ≥18 yrs48.0 (71)69.3 (151)
    Children, <18 yrs52.0 (77)30.7 (67)
Age (4 classes), % (no.)0.00001
    <10 yrs41.2 (61)14.2 (31)
    ≥10 yrs-<18 yrs10.8 (16)16.5 (36)
    ≥18 yrs-<50 yrs42.6 (63)60.1 (131)
    ≥50 yrs5.4 (8)9.2 (20)
Continent, % (no.)0.89
    North America67.6 (100)68.8 (150)
    Europe32.4 (48)31.2 (68)