I have just started to perform a network meta-analysis in stata and I want to know if it is possible to perform a fixed effect network meta-analysis.
moreover, I have some within‐person trials called split mouth trials.
In such trials, the correlations between effects of treatments on the same patients must be considered, since observations are no longer independentbe considered, since observations are no longer independent.
I have read that stata develop statistical approaches to adjusting the dependency of treatment arms within trials with a special design, reporting continuous variables, the adjusting variance approach.
Code:
* Example generated by -dataex-. To install: ssc install dataex clear input byte ID str20 Study str19 treat byte N double(TxEffect SD) str8 StudyDesign 1 "Sculean 2001b" "Flap op" 14 1.7 1.5 "Parallel" 1 "Sculean 2001b" "EMD" 14 3.4 1.5 "Parallel" 1 "Sculean 2001b" "GTR" 14 3.1 1.5 "Parallel" 1 "Sculean 2001b" "GTR+EMD" 14 3.4 1.1 "Parallel" 2 "Bokan 2006" "Flap op" 18 2.1 1.4 "Parallel" 2 "Bokan 2006" "EMD" 19 3.7 1 "Parallel" 2 "Bokan 2006" "EMD+Bone Grafts" 19 4 1 "Parallel" 3 "Döri 2008b" "EMD+Bone Grafts" 13 5 .9 "Parallel" 3 "Döri 2008b" "EMD+Bone Grafts+PRP" 13 4.8 1.3 "Parallel" 4 "Francetti 2004" "Flap op" 12 2.29 .95 "Parallel" 4 "Francetti 2004" "EMD" 12 4.14 1.35 "Parallel" 5 "Francetti 2005" "Flap op" 46 1.96 2.17 "Parallel" 5 "Francetti 2005" "EMD" 64 3.41 2.15 "Parallel" 6 "Minabe 2002" "EMD" 17 2.6 1 "Parallel" 6 "Minabe 2002" "GTR+EMD" 21 3 1.3 "Parallel" 7 "Sculean 2005b" "EMD" 15 3.9 1.8 "Parallel" 7 "Sculean 2005b" "EMD+Bone Grafts" 15 3.2 1.7 "Parallel" 8 "Silvestri 2000" "Flap op" 10 1.2 1.03 "Parallel" 8 "Silvestri 2000" "EMD" 10 4.5 1.58 "Parallel" 8 "Silvestri 2000" "GTR" 10 4.8 2.09 "Parallel" 9 "Tonetti 2002" "Flap op" 83 2.5 1.5 "Parallel" 9 "Tonetti 2002" "EMD" 83 3.1 1.5 "Parallel" 10 "Zucchelli 2002" "Flap op" 30 2.6 .8 "Parallel" 10 "Zucchelli 2002" "EMD" 30 4.2 .9 "Parallel" 10 "Zucchelli 2002" "GTR" 30 4.9 1.6 "Parallel" 11 "Zucchelli 2003" "EMD" 30 4.9 1 "Parallel" 11 "Zucchelli 2003" "EMD+Bone Grafts" 30 5.8 1.1 "Parallel" 12 "Guida 2007" "EMD" 14 4.6 1.3 "Parallel" 12 "Guida 2007" "EMD+Bone Grafts" 13 4.9 1.8 "Parallel" 13 "Grusovin 2009" "Flap op" 15 3.3 1.2 "Parallel" 13 "Grusovin 2009" "EMD" 15 4.2 1.1 "Parallel" 14 "Yilmaz 2010" "EMD" 20 3.4 1.8 "Parallel" 14 "Yilmaz 2010" "EMD+Bone Grafts" 20 4.2 1.1 "Parallel" 15 "Crea 2008" "EMD" 19 2.8 1.3 "Parallel" 15 "Crea 2008" "GTR" 20 1.7 1.2 "Parallel" 16 "Silvestri 2003" "EMD" 49 4.1 1.8 "Parallel" 16 "Silvestri 2003" "GTR" 49 4.3 1.9 "Parallel" 17 "Sanz 2004" "EMD" 35 3.1 1.8 "Parallel" 17 "Sanz 2004" "GTR" 32 2.5 1.9 "Parallel" 18 "Mayfield 1998" "Flap op" 18 1.3 1.7 "Parallel" 18 "Mayfield 1998" "GTR" 20 1.5 1.9 "Parallel" 19 "Tonetti 1998" "Flap op" 67 2.18 1.46 "Parallel" 19 "Tonetti 1998" "GTR" 69 3.04 1.64 "Parallel" 20 "Cortellini 2001" "Flap op" 54 2.6 1.8 "Parallel" 20 "Cortellini 2001" "GTR" 55 3.5 2.1 "Parallel" 21 "Tonetti 2004" "Flap op" 69 2.5 1.5 "Parallel" 21 "Tonetti 2004" "GTR+Bone Grafts" 61 3.3 1.7 "Parallel" 22 "Döri 2008a" "GTR+Bone Grafts" 14 3.9 .9 "Parallel" 22 "Döri 2008a" "GTR+Bone Grafts+PRP" 14 4.1 .7 "Parallel" 23 "Döri 2007b" "GTR+Bone Grafts" 12 4.6 .8 "Parallel" 23 "Döri 2007b" "GTR+Bone Grafts+PRP" 12 4.7 1.1 "Parallel" 24 "Paolantonio 2008" "Flap op" 17 1.5 1.03 "Parallel" 24 "Paolantonio 2008" "GTR" 17 3.1 1.39 "Parallel" 25 "Döri 2007a" "GTR+Bone Grafts" 15 4.6 1.1 "Parallel" 25 "Döri 2007a" "GTR+Bone Grafts+PRP" 15 4.5 1.1 "Parallel" 26 "Sculean 2005a" "Flap op" 16 1.9 1.1 "Parallel" 26 "Sculean 2005a" "GTR+Bone Grafts" 16 4.1 .9 "Parallel" 27 "Sculean 2003" "Flap op" 14 2.1 1.7 "Parallel" 27 "Sculean 2003" "GTR+Bone Grafts" 14 4 1.3 "Parallel" 28 "Trejo 2000" "GTR" 14 3.27 1.1 "Parallel" 38 "Trejo 2000" "GTR+Bone Grafts" 16 2.29 .61 "Parallel" 29 "Cortellini 1995" "Flap op" 15 2.5 .8 "Parallel" 29 "Cortellini 1995" "GTR" 30 4.7 2.43 "Parallel" 30 "Cortellini 1996" "Flap op" 12 2.3 .8 "Parallel" 30 "Cortellini 1996" "GTR" 24 4.9 1.3 "Parallel" 31 "Stavropoulos 2003" "Flap op" 15 1.5 2.25 "Parallel" 31 "Stavropoulos 2003" "GTR" 14 2.9 2.03 "Parallel" 31 "Stavropoulos 2003" "GTR+Bone Grafts" 15 2.5 2.5 "Parallel" 32 "Cortellini 2011" "Flap op" 15 4.1 1.4 "Parallel" 32 "Cortellini 2011" "EMD" 15 4.1 1.2 "Parallel" 32 "Cortellini 2011" "EMD+Bone Grafts" 15 3.7 1.3 "Parallel" 33 "Siciliano 2011" "EMD" 20 2.4 2.2 "Parallel" 33 "Siciliano 2011" "GTR" 20 4.1 1.4 "Parallel" 34 "Meyle 2011" "EMD" 35 1.93 1.7 "Parallel" 34 "Meyle 2011" "EMD+Bone Grafts" 38 1.69 2.1 "Parallel" 35 "Blumenthal 1990" "Flap op" 10 .75 .63 "Split" 35 "Blumenthal 1990" "GTR" 10 1.17 .32 "Split" 35 "Blumenthal 1990" "GTR+Bone Grafts" 10 2.01 .32 "Split" 36 "Froum 2001" "Flap op" 23 2.75 .91 "Split" 36 "Froum 2001" "EMD" 23 4.26 .6 "Split" 37 "Heijl 1997*" "Flap op" 30 1.7 1.2 "Split" 37 "Heijl 1997*" "EMD" 30 2.3 1.26 "Split" 38 "Okuda 2000" "Flap op" 16 .83 .86 "Split" 38 "Okuda 2000" "EMD" 16 1.72 .83 "Split" 39 "Pontoriero 1999" "Flap op" 10 1.8 1.21 "Split" 39 "Pontoriero 1999" "EMD" 10 3 .63 "Split" 40 "Pontoriero 1999" "Flap op" 30 1.8 1.31 "Split" 40 "Pontoriero 1999" "GTR" 30 3.01 .71 "Split" 41 "Rosing 2005" "Flap op" 14 2.16 2.57 "Split" 41 "Rosing 2005" "EMD" 14 2.01 1.15 "Split" 42 "Chambrone 2010" "Flap op" 10 3.65 1.65 "Split" 42 "Chambrone 2010" "EMD" 10 3.46 1.34 "Split" 43 "Pritlove-Carson 1995" "Flap op" 20 .53 1.12 "Split" 43 "Pritlove-Carson 1995" "GTR" 20 .55 1.62 "Split" 44 "Ratka-Kruger 2000" "Flap op" 11 4 2.78 "Split" 44 "Ratka-Kruger 2000" "GTR" 11 4.18 1.26 "Split" 45 "Christau 2006" "GTR+Bone Grafts" 25 5.2 1.6 "Split" 45 "Christau 2006" "GTR+Bone Grafts+PRP" 25 5 1.02 "Split" 46 "Mellado 1995" "GTR" 11 2.05 .88 "Split" 46 "Mellado 1995" "GTR+Bone Grafts" 11 1.96 1.13 "Split" end
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