Table 3.

Loss to Follow-Up, Improvement in Oral Health–Related QoL, and Self-Reported Oral Health Complaints by Intervention, Excluding GP Offices With Follow-Up <60%

ExperimentalControlχ2 StatisticP ValueIntracluster Correlation CoefficientAdjusted χ2 StatisticAdjusted P Value
Study details
  No. of GP offices810
  No. of study participants210318
Loss to follow-up
  GP offices0 (0)0 (0)N/AN/AN/AN/AN/A
  Study participants39 (18.6)48 (15.1)1.111.2920.0670.356.551
Improvement in oral health–related QoLan = 120bn = 205b
  Functional limitation17 (14.2)17 (8.3)2.788.095–0.005c2.788.095
  Physical pain37 (30.8)43 (21.0)3.964.046–0.005c3.964.046
  Psychologic discomfort21 (17.5)20 (9.8)4.118.042–0.008c4.118.042
  Physical disability12 (10.0)12 (5.9)1.903.1680.0331.152.283
  Psychologic disability22 (18.3)17 (8.3)7.226.0070.0076.355.012
  Social disability4 (3.3)8 (3.9)0.069.793–0.018c0.069.793
  Handicap15 (12.5)10 (4.9)6.193.0130.0105.173.023
  OHIP-NL14 total score46 (38.3)51 (24.9)6.545.011–0.005c6.545.011
Improvement in self-reported oral health complaintsn = 171bn = 270b
  Pain in mouth26 (15.2)28 (10.4)2.277.1310.0111.764.184
  Dry mouth26 (15.2)56 (20.7)2.120.145–0.007c2.120.145
  Bad breath16 (9.4)16 (5.9)1.831.176–0.030c1.831.176
  Any59 (34.5)85 (31.5)0.436.509–0.009c0.436.509
  • GP = general practitioner; N/A = not applicable because GP office is cluster level itself; OHIP-NL14 = 14-item Oral Health Impact Profile; QoL = quality of life.

  • Note: Data in Experimental and Control columns from Loss to follow-up down are presented as n (%).

  • a Subdomains according to Slade.21

  • b Number of patients with a completed baseline and follow-up questionnaire.

  • c To calculate adjusted χ2 statistics, negative intracluster correlation coefficients were set to 0 for these variables.30,31