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Table 2 Hypocalcemia treated postoperatively and prescribed supplements. Rates of postoperative hypocalcemia, rates of prescribed supplements at discharge and rates of prescribed supplements at six-months follow-up. Presented for the whole study population and stratified by indication for surgery

From: Seasonal variation in calcium treatment after thyroidectomy as surrogate for post-operative hypocalcemia: a retrospective register-based national cohort study

TOTAL

Dark group

Bright group

P-value

Hypocalcemia

Treated postoperatively

731/2084 (35.1%)

530/1786 (29.7%)

< 0.001

Supplements prescribed at discharge

Vitamin D

349/2084 (16.7%)

247/1786 (13.8%)

0.012

Calcium

651/2084 (31.2%)

468/1786 (26.2%)

< 0.001

Both Calcium and Vitamin D

302/2084 (15.5%)

205/1786 (11,5%)

0.006

Supplements prescribed at 6 month follow up

Vitamin D

78/1853 (4.2%)

56/1536 (3.6%)

0.352

Calcium

121/1853 (6.5%)

65/1536 (4.2%)

0.003

Both Calcium and Vitamin D

57/1838 (3,1%)

38/1530 (2,5%)

0.2811

MALIGNANCY

Hypocalcemia

Treated postoperatively

168/433 (38.8%)

152/387 (39.3%)

0.889

Supplements prescribed at discharge

Vitamin D

103/433 (23.8%)

88/387 (22.7%)

0.723

Calcium

153/433 (35.3%)

138/387 (35.7%)

0.923

Supplements prescribed at 6 month follow up

Vitamin D

27/396 (6.8%)

27/351 (7.7%)

0.645

Calcium

40/395 (10.1%)

30/344 (8.7%)

0.515

GOITER

Hypocalcemia

Treated postoperatively

166/578 (28.7%)

104 (22.1%)

0.015

Supplements prescribed at discharge

Vitamin D

65/578 (11.2%)

43/470 (9.5%)

0.267

Calcium

140/578 (24.2%)

106/470 (22.6%)

0.526

Supplements prescribed at 6 month follow up

Vitamin D

20/527 (3.8%)

6/413 (1.5%)

0.030

Calcium

31/522 (5.9%)

8/405 (2.0%)

0.003

THYROTOXICOSIS

Hypocalcemia

Treated postoperatively

393/1062 (37.0%)

272/921 (29.5%)

< 0.001

Supplements prescribed at discharge

Vitamin D

181/1062 (17.0%)

115/921 (12.5%)

0.005

Calcium

357/1062 (33.6%)

223/921 (24.2%)

< 0.001

Supplements prescribed at 6 month follow up

Vitamin D

31/930 (3.3%)

23/798 (2.9%)

0.591

Calcium

50/926 (5.4%)

27/780 (3.5%)

0.055