Quality control 550 Quantum theory 344 Quality of Health Care 213 Quality of life 213 Qualitative research 152 Quality Assurance, Health Care 133 Quantum Theory 115 Queens 107 Queer theory 106 Quantum field theory 100 Quality of Life 90 Quality Control 68 Quality of work life 65 Quantitative research 64 Quakers 55 Quality 54 Questioning 52 Quantum computers 41 Quality assurance 38 Qumran community 38 Quantum chemistry 36 Quantum chromodynamics 31 Questionnaires 31 Qualitative Research 29 Quantum groups 26 Quechua Indians 24 Querying (Computer science) 21 Questions and answers 19 Quotations 19 Quantifiers 18 Quantum optics 18 Quality Improvement 16 Quantum electrodynamics 16 Q hypothesis (Synoptics criticism) 15 Quacks and quackery 15 Quantum computing 15 Quantum gravity 15 Queuing theory 14 Quotations, English 13 Quality of products 12 Quantum dots 12 Quarantine 12 Quechua language 12 Query languages (Computer science) 12 Quests (Expeditions) 12 Quotations in the New Testament 12 QAnon conspiracy theory 11 Quantum communication 11 Quantum electronics 11 Quilting 11 Quilts 11 Quality Indicators, Health Care 10 Quarks 10 Quaternions 10 Qi gong 9 Quackery 9 Quarantine, Veterinary 9 Quiché Indians 9 Quaker abolitionists 8 Quotation 8 Qi (Chinese philosophy) 7 Quaker women 7 Quantum statistics 7 Queer people 7 Quotations, American 7 Quantity theory of money 6 Quantum cosmology 6 Quantum systems 6 Quasicrystals 6 Qurʼan as literature 6 Qurʼanic teaching 6 Quantum Dots 5 Queens in literature 5 Queer studies 5 Question (Logic) 5 QSAR (Biochemistry) 4 Qi 4 Qualia 4 Quantitative genetics 4 Quantum chaos 4 Quantum logic 4 Quasiconformal mappings 4 Queer theology 4 Queer youth 4 Quests (Expeditions) in literature 4 Quiché (Central American people) 4 Quinceañera (Social custom) 4 QR codes 3 Qanats 3 Qashqāʼī (Turkic people) 3 Quadriplegics 3 Quantitative Structure-Activity Relationship 3 Quantitative easing (Monetary policy) 3 Quantum Hall effect 3 Quantum biochemistry 3 Quantum entropy 3 Quark-gluon plasma 3 Quarries and quarrying 3 Quarterbacks (Football) 3 Quechua philosophy 3