Query: Has my respiratory rate improved since my last visit?, FHIR Resource: {'resourceType': 'Observation', 'status': 'final', 'category': [{'coding': [{'system': 'http://terminology.hl7.org/CodeSystem/observation-category', 'code': 'vital-signs', 'display': 'Vital signs'}]}], 'code': {'coding': [{'system': 'http://loinc.org', 'code': '77606-2', 'display': 'Weight-for-length Per age and sex'}], 'text': 'Weight-for-length Per age and sex'}, 'subject': {'reference': 'urn:uuid:e32bf962-7e7b-67c7-04fd-c1627f7eb397'}, 'effectiveDateTime': '2014-11-16T11:53:27+05:30', 'valueQuantity': {'value': 43.976, 'unit': '%', 'system': 'http://unitsofmeasure.org', 'code': '%'}, 'interpretation': None}