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Table 3 Interaction terms between socio-economic characteristics and years of survey for maternal service utilization

From: Trends of socioeconomic inequality in using maternal health care services in Lao People’s Democratic Republic from year 2000 to 2012

  ANC SBA
OR 95% CI OR 95% CI
Ethnicity of household head (ref. Lao)
 Non-Lao 0.62b 0.44–0.89 0.65a 0.44-0.97
Mother’s education (ref. no education)
 Primary 1.15 0.76–1.75 1.21 0.75–1.95
 Secondary and higher 0.68 0.40–1.15 1.09 0.64–1.86
Residential area (ref. urban)
 Rural 2.40c 1.52–3.77 2.16b 1.36–3.42
HH wealth index quintile (ref. the poorest quintile)
 Second quintile 0.89 0.51–1.53 0.79 0.40–1.53
 Third quintile 0.99 0.57–1.7 1.27 0.64–2.49
 Fourth quintile 1.28 0.73–2.26 1.23 0.63–2.38
 Richest quintile 3.85c 1.99–7.43 6.41c 3.07–13.38
  1. a: p-value<=0.05; b: p-value<=0.01; c: p-value<=0.001