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Table 2 Description of the articles included in meta-analyses. All study designs are cross-sectional, and all studies used singleton standards to classify low birth weight

From: Low birth weight as a predictor of adverse health outcomes during adulthood in twins: a systematic review and meta-analysis

Study ID (author, year) Country Number of participants Enrollment period Outcome Maternal age Gestational age Zygosity
(MZ/DZ)
Sex
(MM/MF/FF)
Ortqvist 2009 [11] Sweden 10918 2004-2007 Asthma ≤ 19: 18.4%
20-24: 16.1%
25-29: 13.9%
30-34: 13.9%
≥ 35: 11.8%
≤31: 24.8%
32-34: 18.1%
35-36: 14.1%
37-38: 11.7%
39-40: 10.7%
≥ 41: 12.9%
MZ: 13.4%
DZ: 28.4%:
Unknown: 11.7%
-
Rasanen 2000 [26] Finland 4502 1975-1979 Asthma < 25: 31.4%
25-30: 38.8%
> 30: 29.8%
< 33: 7.1%
33-36: 29.0%
37-40: 60.6%
> 40: 3.3%
- -
Villamor 2009 [28] Sweden 32580 1926-1958 Asthma < 20: 2.7%
20-24: 17.0%
25-29: 29.9%
30-34: 27.4%
≥ 35: 22.9%
Missing: 0.1%
31-34: 12.9%
35-36: 20.0%
37-41: 58.7%
42-45: 3.5%
Missing: 4.8%
- MM: 47.2%
FF: 52.8%
Gardner 1995 [25] USA 1079 1959-1966 Cerebral palsy - - MZ: 31.9%
DZ: 58.6%
Unknown: 9.4%
Concordant: 63.9%
Discordant: 36.1%
Suvanand 1997 [27] India 250 1993-1994 Cerebral palsy - - - -