[
  {
    "item_id": "c_001",
    "review_count": 220,
    "avg_rating": 3.2,
    "completion_rate": 0.31,
    "refund_rate": 0.18,
    "top_complaint": "약속한 수익 근거 없음"
  },
  {
    "item_id": "c_002",
    "review_count": 90,
    "avg_rating": 4.4,
    "completion_rate": 0.82,
    "refund_rate": 0.03,
    "top_complaint": null
  },
  {
    "item_id": "c_003",
    "review_count": 40,
    "avg_rating": 4.6,
    "completion_rate": 0.9,
    "refund_rate": 0.01,
    "top_complaint": null
  },
  {
    "item_id": "c_004",
    "review_count": 310,
    "avg_rating": 2.4,
    "completion_rate": 0.12,
    "refund_rate": 0.41,
    "top_complaint": "설치 단계에서 막힘"
  },
  {
    "item_id": "c_005",
    "review_count": 150,
    "avg_rating": 4.1,
    "completion_rate": 0.74,
    "refund_rate": 0.05,
    "top_complaint": "분량이 적음"
  },
  {
    "item_id": "c_006",
    "review_count": 60,
    "avg_rating": 3.6,
    "completion_rate": 0.48,
    "refund_rate": 0.12,
    "top_complaint": "조회수 과장"
  },
  {
    "item_id": "c_007",
    "review_count": 0,
    "avg_rating": null,
    "completion_rate": null,
    "refund_rate": 0,
    "top_complaint": null
  },
  {
    "item_id": "c_009",
    "review_count": 500,
    "avg_rating": 4,
    "completion_rate": 0.66,
    "refund_rate": 0,
    "top_complaint": null
  },
  {
    "item_id": "c_010",
    "review_count": 12,
    "avg_rating": 4.8,
    "completion_rate": 1,
    "refund_rate": 0,
    "top_complaint": null
  },
  {
    "item_id": "c_011",
    "review_count": 130,
    "avg_rating": 3.4,
    "completion_rate": 0.4,
    "refund_rate": 0.15,
    "top_complaint": "자동 수익 아님"
  },
  {
    "item_id": "c_012",
    "review_count": 75,
    "avg_rating": 4.2,
    "completion_rate": 0.71,
    "refund_rate": 0.04,
    "top_complaint": null
  },
  {
    "item_id": "c_099",
    "review_count": 30,
    "avg_rating": 3.9,
    "completion_rate": 0.55,
    "refund_rate": 0.08,
    "top_complaint": "커리큘럼 불일치"
  }
]