Subgroup analysis of administered dose of intravenous iron (a marker of severity of iron-deficiency) and mean change (paired samples t-test differences) in pre- and post-intervention Patient Health Questionnaire-9 (PHQ-9) and Generalised Anxiety-Disorder-7 (GAD-7) scores.

Table 6: Subgroup analysis of administered dose of intravenous iron (a marker of severity of iron-deficiency) and mean change (paired samples t-test differences) in pre- and post-intervention Patient Health Questionnaire-9 (PHQ-9) and Generalised Anxiety-Disorder-7 (GAD-7) scores.

Iron dose (mg)	n	Mean difference	SD	t	p
PHQ-9 (n = 81)
1000	26	2.54	5.70	2.271	0.032
1500	30	4.03	4.67	4.729	< 0.001
2000	25	5.36	4.64	5.781	< 0.001
GAD-7 (n = 81)
1000	26	1.81	2.99	3.08	0.005
1500	30	2.43	5.20	2.56	0.016
2000	25	2.88	2.99	4.82	< 0.001

SD: Standard Deviation