. logistic fit ib(8).mask i.sex i.age ib(2).trust ib(1).ethnic, baselevels Logistic regression Number of obs = 46,771 LR chi2(28) = 2450.75 Prob > chi2 = 0.0000 Log likelihood = -21956.55 Pseudo R2 = 0.0529 ------------------------------------------------------------------------------------------- fit | Odds Ratio Std. Err. z P>|z| [95% Conf. Interval] --------------------------+---------------------------------------------------------------- mask | Alpha Solway 3030V | 4.610658 .4966882 14.19 0.000 3.733072 5.694552 Alpha Solway HX-3 | .8207068 .0341249 -4.75 0.000 .7564761 .8903912 Alpha Solway S-3V | 2.548412 .5119208 4.66 0.000 1.719023 3.777962 Dräger 1730 | .7200994 .0302591 -7.81 0.000 .6631693 .7819167 Dräger 1730V | .958417 .1911142 -0.21 0.831 .6483652 1.416737 Fang Tian FT-045A | .4566648 .1159537 -3.09 0.002 .2776292 .7511554 GVS F31000 | 1 (base) Handanhy HY9330 | .5391098 .022167 -15.03 0.000 .4973679 .5843549 Handanhy HY9632 | .605912 .0283854 -10.69 0.000 .5527554 .6641805 Honeywell Super One | .0309684 .0080199 -13.42 0.000 .0186416 .0514463 Medium Kolmi | .6274658 .0351598 -8.32 0.000 .5622032 .7003044 Meixin MX-2016V | .5148166 .0263815 -12.96 0.000 .4656216 .5692093 Small Kolmi | .7415466 .0515833 -4.30 0.000 .6470343 .8498642 Valmy Spireor VSP352TF | .5424415 .0382406 -8.68 0.000 .4724388 .6228167 | sex | Female | 1 (base) Male | 1.272879 .0442927 6.93 0.000 1.188962 1.36272 | age | 18-24 | 1 (base) 25-34 | 1.06302 .0408342 1.59 0.112 .9859252 1.146144 35-44 | 1.058954 .0423797 1.43 0.152 .9790651 1.145361 45-54 | 1.130245 .046901 2.95 0.003 1.041959 1.226011 55-64 | 1.220278 .0586976 4.14 0.000 1.110489 1.34092 65-74 | 1.186072 .1359568 1.49 0.137 .9474135 1.484849 | trust | East of England | .9863734 .0576986 -0.23 0.815 .8795282 1.106198 London | 1 (base) Midlands | .6228732 .027395 -10.76 0.000 .5714292 .6789486 North East and Yorkshire | .9887165 .0488779 -0.23 0.818 .8974124 1.08931 North West | .909649 .0564925 -1.52 0.127 .8053992 1.027393 South East | .4363628 .0186415 -19.41 0.000 .4013138 .4744727 South West | .2650761 .0267709 -13.15 0.000 .2174728 .3230995 | ethnic | white | 1 (base) black | .9102723 .0362827 -2.36 0.018 .8418663 .9842365 asian | .7831899 .0244107 -7.84 0.000 .7367779 .8325256 mixed | .713108 .0418062 -5.77 0.000 .6357016 .7999397 | _cons | 7.744973 .4263825 37.18 0.000 6.952786 8.62742 ------------------------------------------------------------------------------------------- Note: _cons estimates baseline odds. SO: I used GVS F31000 as reference. Only Alpha Solway 3030V and Alpha Solway S-3V are significantly better. Some are equivalent (Dräger 1730V), all others are worse, some a lot ( Honeywell Super One ). Males show the better fit, and also the age groupps 45 - 64. Asians and mixed have worse fit than whites, and blacks are equivalent. Trusts: Midlands and SoutEast are worse than London, SouthWest more extremely worse. SouthWest has very little mask diversity: -> trust = South West Question_3_Type_of_Mas | k | Freq. Percent Cum. -----------------------+----------------------------------- Alpha Solway 3030V | 3 0.56 0.56 Alpha Solway HX-3 | 74 13.78 14.34 Alpha Solway S-3V | 2 0.37 14.71 Dräger 1730 | 1 0.19 14.90 GVS F31000 | 337 62.76 77.65 Meixin MX-2016V | 120 22.35 100.00 -----------------------+----------------------------------- Total | 537 100.00 they use basically 3 of the 14 models. All other regions have diversity in mask use. See below: . by trust, sort : tabulate mask ----------------------------------------------------------------------------------------------------------------------------------------------------- -> trust = East of England Question_3_Type_of_Mas | k | Freq. Percent Cum. -----------------------+----------------------------------- Alpha Solway 3030V | 155 3.85 3.85 Alpha Solway HX-3 | 304 7.55 11.40 Alpha Solway S-3V | 15 0.37 11.77 Dräger 1730 | 566 14.05 25.82 Dräger 1730V | 3 0.07 25.89 GVS F31000 | 1,059 26.29 52.18 Handanhy HY9330 | 351 8.71 60.90 Handanhy HY9632 | 730 18.12 79.02 Honeywell Super One | 3 0.07 79.10 Medium Kolmi | 332 8.24 87.34 Meixin MX-2016V | 403 10.00 97.34 Small Kolmi | 87 2.16 99.50 Valmy Spireor VSP352TF | 20 0.50 100.00 -----------------------+----------------------------------- Total | 4,028 100.00 ----------------------------------------------------------------------------------------------------------------------------------------------------- -> trust = London Question_3_Type_of_Mas | k | Freq. Percent Cum. -----------------------+----------------------------------- Alpha Solway 3030V | 535 8.20 8.20 Alpha Solway HX-3 | 691 10.59 18.79 Dräger 1730 | 911 13.96 32.75 Dräger 1730V | 11 0.17 32.92 Fang Tian FT-045A | 11 0.17 33.09 GVS F31000 | 1,656 25.38 58.47 Handanhy HY9330 | 825 12.64 71.11 Handanhy HY9632 | 517 7.92 79.03 Honeywell Super One | 3 0.05 79.08 Medium Kolmi | 426 6.53 85.61 Meixin MX-2016V | 344 5.27 90.88 Small Kolmi | 428 6.56 97.44 Valmy Spireor VSP352TF | 167 2.56 100.00 -----------------------+----------------------------------- Total | 6,525 100.00 ----------------------------------------------------------------------------------------------------------------------------------------------------- -> trust = Midlands Question_3_Type_of_Mas | k | Freq. Percent Cum. -----------------------+----------------------------------- Alpha Solway 3030V | 970 7.90 7.90 Alpha Solway HX-3 | 2,795 22.76 30.65 Alpha Solway S-3V | 152 1.24 31.89 Dräger 1730 | 1,496 12.18 44.07 Dräger 1730V | 112 0.91 44.98 Fang Tian FT-045A | 22 0.18 45.16 GVS F31000 | 2,390 19.46 64.62 Handanhy HY9330 | 1,423 11.59 76.21 Handanhy HY9632 | 1,267 10.32 86.52 Honeywell Super One | 1 0.01 86.53 Medium Kolmi | 592 4.82 91.35 Meixin MX-2016V | 555 4.52 95.87 Small Kolmi | 391 3.18 99.06 Valmy Spireor VSP352TF | 116 0.94 100.00 -----------------------+----------------------------------- Total | 12,282 100.00 ----------------------------------------------------------------------------------------------------------------------------------------------------- -> trust = North East and Yorkshire Question_3_Type_of_Mas | k | Freq. Percent Cum. -----------------------+----------------------------------- Alpha Solway 3030V | 17 0.20 0.20 Alpha Solway HX-3 | 754 9.05 9.26 Dräger 1730 | 1,727 20.74 30.00 Dräger 1730V | 12 0.14 30.14 Fang Tian FT-045A | 2 0.02 30.16 GVS F31000 | 2,045 24.56 54.72 Handanhy HY9330 | 1,993 23.93 78.65 Handanhy HY9632 | 231 2.77 81.42 Honeywell Super One | 3 0.04 81.46 Medium Kolmi | 698 8.38 89.84 Meixin MX-2016V | 354 4.25 94.09 Small Kolmi | 328 3.94 98.03 Valmy Spireor VSP352TF | 164 1.97 100.00 -----------------------+----------------------------------- Total | 8,328 100.00 ----------------------------------------------------------------------------------------------------------------------------------------------------- -> trust = North West Question_3_Type_of_Mas | k | Freq. Percent Cum. -----------------------+----------------------------------- Alpha Solway 3030V | 458 12.13 12.13 Alpha Solway HX-3 | 972 25.73 37.86 Dräger 1730 | 909 24.07 61.93 Dräger 1730V | 29 0.77 62.70 GVS F31000 | 803 21.26 83.96 Handanhy HY9330 | 205 5.43 89.38 Handanhy HY9632 | 76 2.01 91.40 Medium Kolmi | 62 1.64 93.04 Meixin MX-2016V | 205 5.43 98.46 Small Kolmi | 13 0.34 98.81 Valmy Spireor VSP352TF | 45 1.19 100.00 -----------------------+----------------------------------- Total | 3,777 100.00 ----------------------------------------------------------------------------------------------------------------------------------------------------- -> trust = South East Question_3_Type_of_Mas | k | Freq. Percent Cum. -----------------------+----------------------------------- Alpha Solway 3030V | 414 3.61 3.61 Alpha Solway HX-3 | 1,638 14.28 17.89 Alpha Solway S-3V | 146 1.27 19.16 Dräger 1730 | 1,462 12.75 31.91 Dräger 1730V | 27 0.24 32.15 Fang Tian FT-045A | 38 0.33 32.48 GVS F31000 | 2,061 17.97 50.45 Handanhy HY9330 | 1,684 14.68 65.13 Handanhy HY9632 | 1,313 11.45 76.58 Honeywell Super One | 156 1.36 77.94 Medium Kolmi | 522 4.55 82.49 Meixin MX-2016V | 912 7.95 90.44 Small Kolmi | 372 3.24 93.69 Valmy Spireor VSP352TF | 724 6.31 100.00 -----------------------+----------------------------------- Total | 11,469 100.00 ----------------------------------------------------------------------------------------------------------------------------------------------------- -> trust = South West Question_3_Type_of_Mas | k | Freq. Percent Cum. -----------------------+----------------------------------- Alpha Solway 3030V | 3 0.56 0.56 Alpha Solway HX-3 | 74 13.78 14.34 Alpha Solway S-3V | 2 0.37 14.71 Dräger 1730 | 1 0.19 14.90 GVS F31000 | 337 62.76 77.65 Meixin MX-2016V | 120 22.35 100.00 -----------------------+----------------------------------- Total | 537 100.00