Table 1

Community based prospective studies with occurrence rates for infantile colic, ranked according to methodological quality

  • 1-150 QS = quality score: range 0–6 (for details see table 3).

  • 1-151 Data on infants younger than 3 months.

  • 1-152 Study with prospective and retrospective part; only prospective data in table.

  • 1-154 nr = not reported.

  • 1-153 Study on Finnish and Colombian infants; only data on Finnish infants in table.

  • 1-159 Wessel's criteria: crying for 3 hours or more on at least 3 days in at least 3 weeks.