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Table 1 Characteristics of studies on the association between serum vitamin D levels and kidney stone risk

From: RETRACTED ARTICLE: Association between serum vitamin D levels and the risk of kidney stone: evidence from a meta-analysis

Study, year Country kidney stones assessed Study type Kidney stone Controls
N (Male) Age (Mean ± SD) Serum vitamin D: Mean ± SD (ng/ml) N (Male) Age (Mean ± SD) Serum vitamin D: Mean ± SD (ng/ml)
Berlin et al. [14] Sweden Symptomatic Case-control 38 (34) Na 26.2 ± 1.6 32 (16) Na 17.6 ± 0.9
Fallahzadeh et al. [15] Iran Ultrasounds Case-control 36 (24) 8.4 ± 4.7 months 33.85 ± 14.73 36 (22) 8.7 ± 4.7 months 18.26 ± 7.43
Giannini et al. [16] Italy Symptomatic Case-control 25 (16) 41.2 ± 2.4 39.6 ± 2.6 15 (7) 49.0 ± 3.7 28.9 ± 1.8
Jarrar et al. [17] Germany Ultrasounds Case-control 57 (35) 54.92 ± 23.32 53.65 ± 27.46 44 (22) 53.34 ± 18.51 48.3 ± 30.8
Leaf et al. [18] United States Ultrasounds Randomized controlled trials 29 (22) 48 ± 12 35 ± 10 29 (22) 48 ± 12 17 ± 6
Netelenbos et al. [19] Netherlands Symptomatic Case-control 160 (106) 43 ± 14 55 ± 23 217 (147) 39 ± 11 53 ± 22
Shakhssalim et al. [20] Iran Symptomatic Case-control 106 (106) 43.4 ± 6.9 127 ± 40 109 (109) 38.4 ± 6.9 93 ± 35
  1. SD standard deviation; Na not available