study	treatment	mean	std.dev	sampleSize
1    	A       	-1.22	0.504	1
1    	C       	-1.53	0.439	1
2    	A       	-0.7	0.282	1
2    	B       	-2.4	0.258	1
3    	A       	-0.3	0.505	1
3    	B       	-2.6	0.510	1
3    	D       	-1.2	0.478	1
