67 Maxillary implant overdentures: four or two implants Table 4.4 | [continued] 2-implant group 4-implant group 2 versus 4 implants Pre-treatment After 1 year Pre-treatment After 1 year Pre- treatment After 1 year Oral health impact profile-NL49 p-value p-value p-value p-value Functional limitation [Q1-Q3] 16.5 [13.5 – 20.25] 4 [3 – 7] <0.001**c 18 [12 -23] 5 [2 – 9] <0.001**c 0.690 d 0.740 d Physical pain [Q1-Q3] 13 [8.25 – 19] 6 [5 – 9] 0.001**c 12.5 [7.75 – 21.75] 4 [3 – 9] <0.001**c 0.849 d 0.393 d Psychological discomfort [Q1-Q3] 10.5 [2 – 15] 1 [0 – 5] 0.005**c 10.5 [3.25 – 17.25] 3 [0.5 – 4.5] 0.001**c 0.899 d 0.773 d Physical disability [Q1-Q3] 13.5 [8.75 – 22] 4 [2 – 7] 0.001**c 20 [9.75 – 27.25] 2 [1.5 – 7.5] <0.001**c 0.199 d 0.730 d Psychological disability [Q1-Q3] 10 [2.25 – 13] 1 [0 – 3] 0.002**c 8 [1.5 – 11.25] 0 [0 – 4] 0.001**c 0.577 d 0.677 d Social disability [Q1-Q3] 5 [0.75 – 12] 1 [0 – 4] 0.001**c 5 [0.75 – 8.5] 2 [0 – 4] 0.004**c 0.762 d 0.598 d Handicap [Q1-Q3] 6 [0.75 – 10.25] 2 [0 – 3] 0.002**c 4.5 [0 – 4.5] 1 [0 – 3] 0.001**c 0.949 d 0.507 d Total OHIP-NL49 score [Q1-Q3] 63.5 [31.75 – 92.75] 16 [12 – 20] <0.001**c 69.5 [31.25 – 83] 17 [8 – 27] <0.001**c 0.740 d 1.000 d Differences between the study groups were tested with the aPaired-samples T-test, the bIndependent samples T-test, the cWilcoxon Signed Rank test or the dMann– Whitney U test. [Q1 – Q3]: interquartile range; NA: not applicable; SD: standard deviation. *:p<0.05, **:p<0.01. 4
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