Page 135 - สถิติทางวิทยาศาสตร์สุขภาพ เพื่อการวิจัย

ên[95% ™à«ß§«“¡‡™◊ËÕ¡—Ëπ¢Õß OR] = ên(OR) £ Z SE(ên OR)
0.025
= ên(5.3) £ 1.96 Ó 0.539
= 0.6108, 2.7245
0.6108 2.7245
95% ™à«ß§«“¡‡™◊ËÕ¡—Ëπ¢Õß OR = e , e
= 1.842, 15.249

™à«ß§«“¡‡™◊ËÕ¡—Ëπ¢Õß OR ∑’˧”π«≥‰¥â¡’§à“¡“°°«à“ 1 · ¥ß«à“Õ“¬ÿ¡’§«“¡ —¡æ—π∏å
°—∫°“√‡°‘¥¿“«–´÷¡‡»√â“ ‚¥¬æ∫«à“°≈ÿà¡À≠‘ß∑’Ë¡’Õ“¬ÿ¡“°¡’ —¥ à«π¢ÕߺŸâ¡’¿“«–´÷¡‡»√â“

Õ¬à“ßπâÕ¬ 1.8 ‡∑à“ À√◊ÕÕ“®¡“°°«à“∂÷ß 15.2 ‡∑à“ ‡¡◊ËÕ‡∑’¬∫°—∫°≈ÿà¡À≠‘ß∑’ËÕ“¬ÿπâÕ¬°«à“

µ—«Õ¬à“ß∑’Ë 7.7

π—°«‘®—¬µâÕß°“√»÷°…“«à“‡°…µ√°√∑’Ë Ÿ∫∫ÿÀ√’Ë¡’‚Õ°“ ‰¥â√—∫æ‘…¬“¶à“·¡≈ß¡“°°«à“
‡°…µ√°√∑’ˉ¡à Ÿ∫∫ÿÀ√’ËÀ√◊Õ‰¡à ‚¥¬ÕÕ°·∫∫ß“π«‘®—¬‡ªìπ·∫∫°≈ÿࡺŸâªÉ«¬-‰¡àªÉ«¬ (case-control

study) µ—«Õ¬à“ß∑—Èß 2 °≈ÿà¡∂Ÿ°®—∫§Ÿà¥â«¬Õ“¬ÿ·≈–‡æ» º≈°“√»÷°…“· ¥ß„πµ“√“ßµàÕ‰ªπ’È ®ß
√ÿªº≈°“√«‘®—¬

°≈ÿࡺŸâ‰¥â√—∫æ‘…¬“¶à“·¡≈ß

Ÿ∫∫ÿÀ√’Ë ‰¡à Ÿ∫∫ÿÀ√’Ë √«¡
°≈ÿࡺŸâ∑’ˉ¡à‰¥â√—∫ Ÿ∫∫ÿÀ√’Ë 2 3 5
æ‘…¬“¶à“·¡≈ß ‰¡à Ÿ∫∫ÿÀ√’Ë 10 25 35

(°≈ÿࡧ«∫§ÿ¡) √«¡ 12 28 40

§”π«≥§à“ OR „π°√≥’∑’˪√–™“°√∑—Èß 2 °≈ÿࡉ¡à‡ªìπÕ‘ √–µàÕ°—π
b 3
OR = = = 0.3
c 10

1 1 1 1
SE(ên OR) = + = +
b c 3 10
= 0.658
ên(95% ™à«ß§«“¡‡™◊ËÕ¡—Ëπ¢Õß OR) = ên(0.3) £ Z Ó 0.658
0.025
= -2.4942, 0.0863
-2.4942 0.0863
95% ™à«ß§«“¡‡™◊ËÕ¡—Ëπ¢Õß OR = e , e
= 0.083, 1.09

134 ∫∑∑’Ë 7 °“√À“§«“¡ —¡æ—π∏å¢Õßµ—«·ª√∑’ˇªìπ¢âÕ¡Ÿ≈°≈ÿà¡

∫∑∑’Ë 7 134 31/7/09, 4:40 PM