Table 1.

Characteristics of the studies analyzing the impact of cesarean section on offspring respiratory tract infections which met the inclusion criteria of both the present systematic review and meta-analysis.

Author	Country	Study Design	Sample Size	Age	Assessed Respiratory Morbidity
Kristensen et al. [20]	Denmark	Cohort Retrospective	790,569	from 0 to 14 y	lower respiratory tract infection
Magnus et al. [68]	Norway	Cohort Prospective (Norwegian Mother and Child Cohort Study)	37,171	36 months	recurrent lower respiratory tract infections
Peters et al. [81]	Australia	Cohort Prospective	491,590	in the first 28 days and up to 5 y	respiratory infection