Ưu điểm chính của một nghiên cứu thử nghiệm, trái ngược với một nghiên cứu tương quan là:

Nghiên cứu theo dõi là một loại nghiên cứu trong đó các đối tượng được theo dõi trong một khoảng thời gian dài để theo dõi sự thay đổi của họ theo thời gian.

Nghiên cứu thuần tập (cohort study) theo dõi một nhóm người theo thời gian để xem xét sự phát triển của bệnh hoặc kết quả. Trong nghiên cứu thuần tập, đối tượng được chọn dựa trên việc họ có tiếp xúc với một yếu tố nguy cơ hay không, chứ không phải dựa trên việc họ đã mắc bệnh hay chưa. Do đó, sai số chọn thường thấp hơn so với các nghiên cứu quan sát khác như nghiên cứu bệnh chứng (case-control study), nơi đối tượng được chọn dựa trên tình trạng bệnh, làm tăng khả năng sai số chọn do cách chọn nhóm chứng.

Giá trị suy luận căn nguyên (khả năng chứng minh mối quan hệ nhân quả) của các thiết kế nghiên cứu được sắp xếp như sau:

* Nghiên cứu bệnh chứng (c): Đây là thiết kế yếu nhất trong việc suy luận căn nguyên vì nó bắt đầu với bệnh và hồi cứu để tìm yếu tố nguy cơ. Điều này dễ dẫn đến sai lệch do nhớ lại và khó xác định trình tự thời gian.
* Nghiên cứu thuần tập hồi cứu (b): Nghiên cứu này mạnh hơn bệnh chứng vì nó xác định кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого кого 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Phương pháp nghiên cứu bệnh chứng là một phương pháp nghiên cứu hồi cứu (retrospective), trong đó người ta so sánh một nhóm người mắc bệnh (nhóm bệnh) với một nhóm người không mắc bệnh (nhóm chứng) để tìm hiểu xem có những yếu tố nào trong quá khứ có thể liên quan đến sự phát triển của bệnh. Một trong những nhược điểm lớn nhất của phương pháp này là sự phụ thuộc vào hồ sơ và trí nhớ của đối tượng nghiên cứu, điều này có thể dẫn đến sai lệch (bias) do thông tin không đầy đủ hoặc không chính xác. Vì hồ sơ bệnh án có thể không đầy đủ hoặc bị mất, và người tham gia có thể không nhớ chính xác các sự kiện hoặc yếu tố phơi nhiễm trong quá khứ. Do đó, đáp án "Tài liệu, hồ sơ cần thiết không hòan chỉnh" là nhược điểm lớn nhất của phương pháp này. Các đáp án khác có thể đúng trong một số trường hợp nhất định, nhưng không phải là nhược điểm cốt lõi của phương pháp nghiên cứu bệnh chứng như việc thiếu tài liệu hoặc hồ sơ hoàn chỉnh.

Thiết kế nghiên cứu thực nghiệm (c) cho phép kiểm soát các biến số và thiết lập mối quan hệ nhân quả rõ ràng nhất, do đó có giá trị suy luận căn nguyên cao nhất. Thiết kế trường hợp (b) có thể gợi ý mối liên hệ nhưng không chứng minh được nhân quả. Thiết kế tương quan (a) chỉ cho thấy mối liên hệ thống kê giữa các biến, không thể suy luận về quan hệ nhân quả. Vậy, trình tự giảm dần về "Giá trị suy luận căn nguyên" là: Thực nghiệm (c), Trường hợp (b), Tương quan (a).