BMJ Statistical Notes Series List by JM Bland: http://www-users.york ...

BMJ 2011;342:d561 doi: 10.1136/bmj.d561 Page 3 of 3
Table
Table 1| Simulated data from a randomised trial comparing two groups of 30 patients, with a true change from baseline but no difference
between groups (sorted by baseline values within each group)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Group A
Baseline 6 months Change
6.4
6.6
7.3
7.7
7.7
7.9
8.0
8.0
8.1
9.2
9.3
9.6
9.7
9.8
9.8
10.2
10.3
10.6
10.6
10.7
10.9
11.1
11.2
11.8
12.3
12.4
13.1
13.2
13.3
13.7
Mean 10.02
SD
2.06
7.1
5.6
8.3
9.1
9.5
9.6
8.5
8.5
9.1
9.6
8.7
10.7
9.0
9.0
8.0
11.1
11.5
9.1
12.0
13.2
9.7
12.2
10.8
11.9
12.2
12.6
15.0
13.8
14.1
14.2
10.46
2.29
0.7
-1.0
1.0
1.4
1.8
1.7
0.5
0.5
1.0
0.4
-0.6
1.1
-0.7
-0.8
-1.8
0.9
1.2
-1.5
1.4
2.5
-1.2
1.1
-0.4
0.1
-0.1
0.2
1.9
0.6
0.8
0.5
0.44
1.06
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Group B
Baseline 6 months Change
6.8
7.2
7.2
7.4
7.5
7.5
8.3
8.4
8.7
9.0
9.2
9.6
9.9
10.1
10.2
10.3
10.4
10.5
10.7
10.8
10.8
11.1
11.1
11.4
11.6
11.7
12.0
12.3
13.7
13.9
Mean 9.98
SD
1.90
7.9
7.5
6.9
6.9
8.3
9.4
9.0
8.8
8.0
7.2
7.1
10.6
11.0
11.5
10.4
11.0
9.9
11.3
9.9
10.7
11.8
10.0
13.2
11.8
12.1
11.5
12.7
13.7
12.6
13.7
10.21
2.09
1.1
0.3
-0.3
-0.5
0.8
1.9
0.7
0.4
-0.7
-1.8
-2.1
1.0
1.1
1.4
0.2
0.7
-0.5
0.8
-0.8
-0.1
1.0
-1.1
2.1
0.4
0.5
-0.2
0.7
1.4
-1.1
-0.2
0.24
1.02
RESEARCH METHODS & REPORTING
Reprints: http://journals.bmj.com/cgi/reprintform Subscribe: http://resources.bmj.com/bmj/subscribers/how-to-subscribe