"healthy user bias" meaning in English

{
  "forms": [
    {
      "form": "healthy user biases",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "healthy user bias (countable and uncountable, plural healthy user biases)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Biases",
          "orig": "en:Biases",
          "parents": [
            "Psychology",
            "Statistics",
            "Social sciences",
            "Formal sciences",
            "Mathematics",
            "Sciences",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A potential bias in epidemiologic studies, involving the fact that subjects who voluntarily enroll in a clinical trial and actually follow the experimental regimen are likely to be healthier than the general population."
      ],
      "id": "en-healthy_user_bias-en-noun-D~iwKItD",
      "links": [
        [
          "epidemiologic",
          "epidemiologic"
        ],
        [
          "subject",
          "subject"
        ],
        [
          "regimen",
          "regimen"
        ]
      ],
      "synonyms": [
        {
          "word": "healthy worker bias"
        }
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "Translations",
          "word": "terveellisen käyttäjän vinouma"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "Translations",
          "tags": [
            "masculine"
          ],
          "word": "Healthy-Worker-Effekt"
        }
      ]
    }
  ],
  "word": "healthy user bias"
}

{
  "forms": [
    {
      "form": "healthy user biases",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "healthy user bias (countable and uncountable, plural healthy user biases)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English uncountable nouns",
        "Translation table header lacks gloss",
        "en:Biases"
      ],
      "glosses": [
        "A potential bias in epidemiologic studies, involving the fact that subjects who voluntarily enroll in a clinical trial and actually follow the experimental regimen are likely to be healthier than the general population."
      ],
      "links": [
        [
          "epidemiologic",
          "epidemiologic"
        ],
        [
          "subject",
          "subject"
        ],
        [
          "regimen",
          "regimen"
        ]
      ],
      "synonyms": [
        {
          "word": "healthy worker bias"
        }
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "Translations",
      "word": "terveellisen käyttäjän vinouma"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "Translations",
      "tags": [
        "masculine"
      ],
      "word": "Healthy-Worker-Effekt"
    }
  ],
  "word": "healthy user bias"
}