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Table 2 Comparison of the characteristics of participants with completed data vs. without completed data

From: Effectiveness of a family-centered behavioral and educational counselling approach to improve periodontal health of pregnant women: a randomized controlled trial

  Followed-up participants Drop-out participants Followed-up vs. Drop-out p-value*
Test (n = 186) Control (n = 183) Total (n = 369) p-value* Test (n = 110) Control (n = 110) Total (n = 220) p-value*
Age (year, mean ± SD) 31.2 ± 3.7 31.9 ± 4.2 31.5 ± 4.0 0.765 31.0 ± 3.8 30.5 ± 4.1 30.4 ± 4.4 0.449 < 0.01
Gestational age (weeks, mean ± SD) 14.3 ± 2.7 14.5 ± 2.9 14.4 ± 2.7 0.439 14.3 ± 2.5 14.3 ± 2.5 14.3 ± 2.7 0.983 0.644
Education level (%)
 Junior high school or below 9.4 7.6 9.0 0.633 15.5 11.0 10.9 0.043 0.063
 Senior high school 19.2 22.4 20.4   20.2 37.8 27.7  
 Tertiary education or above 71.4 70.0 70.6   64.3 51.2 61.4  
Dental scheme coverage (%)
 No 57.3 59.5 61.2 0.639 67.9 68.3 63.0 0.952 0.669
 Yes 42.7 40.5 38.8   37.0 31.7 37.0  
Monthly household income (HKD, %)
  < $20,000 13.1 15.7 14.7 0.205 20.2 25.6 20.1 0.438 0.320
 $20,000- < $30,000 18.3 18.1 19.9   22.6 31.7 21.9  
 $30,000- < $40,000 22.1 16.2 20.4   20.2 14.6 15.5  
 $40,000- < $60,000 31.0 27.1 28.3   25.0 20.7 26.0  
  > $60,000 15.5 22.9 16.6   11.9 7.3 16.4  
Smoking (%)
 No 95.8 96.3 96.2  0.369 94.8 95.2 95.1  0.688 0.650
 Yes 4.2 3.7 3.8   5.2 4.8 4.9  
  1. * p-value obtained using Mann-Whitney U test for continuous data and X2 test for categorical data, X2 exact test for smoking