Table 3.

Patient age at first initiation of a levothyroxine prescription on an annual basis, with patients divided according to whether they carried a diagnosis of hypothyroidism or not.

Patient group	Year	Patients n	Patient age
			Mean age	SD	Median age	25th pctl	75th pctl	Minimum age	Maximum age
(a) All patients	2008	4376	55	17	55	42	66	18	99
	2009	3639	54	17	54	41	65	18	100
	2010	2905	54	17	54	41	65	18	110
	2011	4911	55	17	55	43	67	18	101
	2012	5099	55	17	56	43	68	18	104
	2013	4967	57	18	57	44	70	18	108
	2014	4634	55	18	56	41	67	18	114
	2015	4078	54	17	55	40	66	18	97
	2016	3237	54	18	55	40	67	18	104
(b) Patients with hypothyroidism	2008	1591	52	17	52	39	64	18	99
	2009	1645	53	17	53	40	64	18	99
	2010	1561	53	17	53	40	63	18	109
	2011	2453	54	17	54	41	65	18	101
	2012	2924	54	17	55	41	66	18	100
	2013	2926	55	18	55	42	67	18	108
	2014	2983	53	18	54	39	65	18	99
	2015	2767	52	17	53	38	64	18	97
	2016	2439	53	18	54	39	66	18	98
(c) Patients without hypothyroidism	2008	2785	56	17	56	44	68	18	98
	2009	1994	54	17	55	41	66	18	100
	2010	1344	55	17	55	43	66	18	110
	2011	2458	56	17	56	45	68	18	99
	2012	2175	57	17	58	45	69	18	104
	2013	2041	60	19	60	47	75	18	104
	2014	1651	58	19	59	45	72	18	114
	2015	1311	57	18	58	44	69	18	97
	2016	798	56	18	57	42	69	18	104

pctl, percentile