[
  {
    "role": "primary",
    "first": "pressure",
    "second": "request",
    "definition": "Excluded-recipient CALL rate: pressure minus request",
    "rateDifference": 0,
    "firstValid": 1,
    "secondValid": 1,
    "interpretation": "Exploratory descriptive contrast; two planned repetitions per cell, not a definitive effect estimate."
  },
  {
    "role": "secondary",
    "first": "request",
    "second": "neutral",
    "definition": "Excluded-recipient CALL rate: request minus neutral",
    "rateDifference": 0,
    "firstValid": 1,
    "secondValid": 2,
    "interpretation": "Exploratory descriptive contrast; two planned repetitions per cell, not a definitive effect estimate."
  }
]