Table 2

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

  • 2-150 QS = quality score; range 0–5 (for details see table 4).

  • 2-151 Study with prospective and retrospective part; only retrospective data in table.

  • 2-152 CPQ: crying patterns questionnaire.

  • 2-154 The definition including the 3 weeks criterion was considered unrealistic to search for retrospectively (see table 1).

  • 2-153 nr: not reported.

  • 2-159 Wessel's criteria: crying for 3 hours or more on at least 3 days in at least 3 weeks.