Performance of Orthopaedic Shoulder and Elbow Surgeons on a Biostatistical Knowledge Examination

Table 2

Percentage of correct answers for biostatistical knowledge examination.

Question	Objective	No. correct %	CI %
1a	Identify continuous variable	76.4	(63.5 to 85.8)
1b	Identify ordinal variable	58.2	(45.0 to 70.3)
1c	Identify nominal variable	45.5	(33.0 to 58.5)
2	Recognise a case-control study	54.6	(41.5 to 67.0)
3	Recognise purpose of double-blind studies	92.7	(82.3 to 97.6)
4a	Identify ANOVA	60	(46.8 to 71.9)
4b	Identify chi squared test	27.3	(17.2 to 40.3)
4c	Identify t test	76.4	(63.5 to 85.8)
5	Recognise definition of bias	47.3	(34.7 to 60.2)
6	Interpret the meaning of value >0.05	54.6	(41.5 to 67.0)
7	Identify cox proportional hazard regression	16.4	(8.6 to 28.5)
8	Interpret standard deviation	69.1	(55.9 to 79.8)
9	Interpret 95% CI and statistical significance	9.1	(3.5 to 20.0)
10	Recognise power, sample size, and significance-level relationship	52.7	(39.8 to 65.3)
11	Determine which test has more specificity	63.6	(50.4 to 75.1)
12	Interpret an unadjusted odds ratio	72.7	(59.7 to 82.8)
13	Interpret odds ratio in multivariate regression analysis	43.6	(31.4 to 56.7)
14	Interpret relative risk	96.4	(87.0 to 99.7)
15	Determine strength of evidence for risk factors	74.6	(61.6 to 84.3)
16	Interpret Kaplan–Meier analysis results	12.7	(6.0 to 24.3)