Summary performance statistics
| Voice assistant | Alexa | Google Assistant | Siri |
| Mean score | 0.98 | 5.10 | 5.16 |
| VA provided same response to both authors | 62.96% | 70.37% | 68.52% |
| VA understood question and provided answer | 25% | 94% | 94% |
| Average spoken words per answer | 29 | 21 | 13 |
| Most cited source | Wikipedia.org | CDC.gov | CDC.gov |
VA, voice assistant.