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Table 1 Numbers of births with missing data, by type of data.

From: Racial discrepancies in the association between paternal vs. maternal educational level and risk of low birthweight in Washington State

Type of missing data Births (%) missing
Maternal age 296 (0.1%)
Maternal race 9966 (2.9%)
Maternal education 35670 (10.3%)
Any maternal key data 48307 (13.9%)
Paternal age 29997 (8.6%)
Paternal race 39772 (11.5%)
Paternal education 73421 (21.15%)
Any paternal key data 77737 (22.4%)
Any key data 82297 (23.7%)
  1. Numbers of births with missing data, by type of data. Note, some births had more than one type of missing data. "Key data" includes age, race and educational attainment.