Table 2. TSH Levels Within 6 Weeks and 12 Months After Index Date Among Nonswitchers vs Switchers.

	Patients, No. (%)		Risk or mean difference (95% CI)	P value
	Nonswitchers (n = 2780)	Switchers (n = 2780)
TSH level
Normal (0.3-4.4 mIU/L)	2298 (82.7)	2348 (84.5)	Risk difference: −0.018 (−0.038 to 0.002)	.07
Abnormal (<0.3 or >4.4 mIU/L)	482 (17.3)	432 (15.5)	Risk difference: 0.018 (−0.002 to 0.038)	.07
Markedly abnormal (<0.1 or >10 mIU/L)	87 (3.1)	69 (2.5)	Risk difference: 0.007 (−0.002 to 0.015)	.14
Mean TSH level, (SD), mIU/L	2.7 (2.3)	2.7 (3.3)	Mean difference: 0.01 (−0.14 to 0.16)	.94
Mean TSH level change from baseline, (SD), mIU/L	0.51 (2.28)	0.53 (3.25)	Mean difference: −0.02 (−0.16 to 0.13)	.84

Abbreviation: TSH, thyrotropin.