Table 6

Spearman correlation coefficients (r) of refraction versus lens thickness, refraction versus lens power, and lens thickness versus lens power in the group of twins with (+) IDDM and the group of twins without (−) IDDM

	Eye	n	r	p
+ IDDM:
Refraction v lens thickness	R	51	−0.16	0.27
	L	51	−0.15	0.30
Refraction v lens power	R	50	−0.15	0.30
	L	50	−0.03	0.82
Lens thickness v lens power	R	50	0.47	0.001
	L	50	0.49	0.000
− IDDM:
Refractionv lens thickness	R	37	0.34	0.04
	L	37	0.40	0.02
Refraction v lens power	R	36	0.26	0.12
	L	36	0.33	0.04
Lens thickness v lens power	R	36	0.49	0.003
	L	36	0.48	0.003