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. Author manuscript; available in PMC: 2013 Mar 29.
Published in final edited form as: J Perinatol. 2008 Feb 14;28(5):354–360. doi: 10.1038/sj.jp.7211918

Table 1.

Low birth weight classification groups: Colorado, 1991–1996 vs 1997–2003

Classification Birth weight
(g)		 1991–1996
No. live births
(% of all births)		 1997–2003
No. live births
(% of all births)
Threshold of viability <750 1029 (0.31) 1664 (0.37)
Extremely low birth weight <1000 1909 (0.6) 2907 (0.6)
Very low birth weight <1500 4159 (1.3) 6117 (1.3)
Low birth weight <2500 28 288 (8.6) 39 981 (8.9)

Rows and totals are not mutually exclusive. P-values are <0.01 for each row comparison between time periods, but this is not inferred to be of practical significance.