TABLE 2

Number of Infants Choking or Gagging Each Month According to the Questionnaire and Calendar

AgeaControlBLISSRR (95% CI)bPc
Choked at least once, by questionnaired
 0 to <6 mo6/85 (7.1)8/96 (8.3)1.10 (0.39–3.10).86
 6 mo19/88 (21.6)17/94 (18.1)0.86 (0.48–1.54).61
 7 mo7/83 (8.4)11/91 (12.1)1.31 (0.53–3.21).56
 8 mo16/88 (18.2)14/95 (14.7)0.78 (0.40–1.52).46
 11 mo13/81 (16.0)18/93 (19.4)1.21 (0.63–2.31).57
Choked at least once, by calendar
 6 mo20/79 (25.3)14/86 (16.3)0.67 (0.37–1.23).20
 8 mo14/74 (18.9)14/78 (17.9)0.94 (0.48–1.87).87
Gagged at least once, by questionnaired
 0 to <6 mo51/85 (60.0)57/96 (59.4)0.99 (0.78–1.26).93
 6 mo71/88 (80.7)89/94 (94.7)1.17 (1.05–1.31)<.01
 7 mo63/83 (75.9)71/91 (78.0)1.03 (0.87–1.21).72
 8 mo72/88 (81.8)78/95 (82.1)1.01 (0.88–1.16).86
 11 mo38/81 (46.9)42/93 (45.2)1.04 (0.79–1.37).78
Gagged at least once, by calendar
 6 mo66/79 (83.5)80/85 (94.1)1.13 (1.01–1.26).03
 8 mo66/73 (90.4)67/79 (84.8)0.94 (0.84–1.06).34
  • Data expressed as number of participants who choked or gagged/number of participants with data (%).

  • a Months refer to whole months, unless stated otherwise, so that “8 mo” refers to 8.0–8.9 mo of age.

  • b RR in BLISS participants compared with control participants. Data were analyzed via Poisson regression with robust SEs, controlling for maternal education and parity (the stratification variables used at randomization).

  • c P value is for RR in BLISS participants compared with control participants, controlling for maternal education and parity (the stratification variables used at randomization).

  • d Questionnaire data were collected retrospectively at the beginning of the next month. For example, the data reported here for age 6 mo were collected in the 7-mo questionnaire.