<status value="active"/><author><name value="Brian S. Alper, MD, MSPH"/></author><publisher value="HL7 International / Clinical Decision Support"/><contact><telecom><system value="url"/><value value="http://www.hl7.org/Special/committees/dss"/></telecom></contact><copyright value="https://creativecommons.org/licenses/by-nc-sa/4.0/"/><description value="This example uses the StatisticModelIncludeIf extension to represent the model characteristic of Welch's 2-sample t-test if the data is consistent with a normal distribution (based on Shapiro-Wilk test with p-value >= 0.05) and a Wilcoxon Mann-Whitney test if not."/><variableDefinition><description value="Adults with hypertension"/><variableRole value="population"/></variableDefinition><variableDefinition><description value="Reversitol vs. Placebo"/><variableRole value="exposure"/></variableDefinition><variableDefinition><description value="Change in systolic blood pressure from baseline to 3 months"/><variableRole value="outcome"/></variableDefinition><studyDesign><coding><system value="https://fevir.net/sevco"/><code value="SEVCO:01003"/><display value="randomized assignment"/></coding></studyDesign><statistic><statisticType><coding><system value="https://fevir.net/sevco"/><code value="STATO:0000457"/><display value="difference in means"/></coding></statisticType><modelCharacteristic><extension url="http://hl7.org/fhir/StructureDefinition/statistic-model-include-if"><extension url="attribute"><valueCodeableConcept><text value="data distribution"/></valueCodeableConcept></extension><extension url="value"><valueCodeableConcept><text value="normal distribution (Shapiro-Wilk test with p-value >= 0.05)"/></valueCodeableConcept></extension></extension><code><text value="Welch's 2-sample t-test"/></code><intended value="true"/></modelCharacteristic><modelCharacteristic><extension url="http://hl7.org/fhir/StructureDefinition/statistic-model-include-if"><extension url="attribute"><valueCodeableConcept><text value="data distribution"/></valueCodeableConcept></extension><extension url="value"><valueCodeableConcept><text value="not consistent with normal distribution (Shapiro-Wilk test with p-value < 0.05)"/></valueCodeableConcept></extension></extension><code><text value="Wilcoxon Mann-Whitney test"/></code><intended value="true"/></modelCharacteristic></statistic></Evidence>