Table 2 Association between serum bicarbonate level and renal hyperfiltration

Total

1^st

300/6550 (4.6)

1.39 (1.11 to 1.75)

2^nd

322/7106 (4.5)

1.41 (1.13 to 1.76)

3^rd

188/3885 (4.8)

1.55 (1.22 to 1.98)

4^th

193/6110 (3.2)

1.02 (0.81 to 1.30)

5^th

111/3801 (2.9)

Reference

Sex

Men

1^st

128/3294 (3.9)

1.40 (1.01 to 1.93)

0.9999

2^nd

145/3715 (3.9)

1.39 (1.02 to 1.97)

3^rd

87/2067 (4.2)

1.51 (1.08 to 2.26)

4^th

95/3411 (2.8)

1.00 (0.72 to 1.46)

5^th

59/2235 (2.6)

Reference

Women

1^st

172/3256 (5.3)

1.39 (1.01 to 1.93)

2^nd

177/3391 (5.2)

1.43 (1.04 to 1.97)

3^rd

101/1818 (5.6)

1.60 (1.13 to 2.26)

4^th

98/2699 (3.6)

1.03 (0.73 to 1.46)

5^th

52/1566 (3.3)

Reference

Age

Young

1^st

194/3839 (5.1)

1.66 (1.18 to 2.32)

0.6341

2^nd

192/3878 (5.0)

1.68 (1.21 to 2.35)

3^rd

105/2040 (5.1)

1.81 (1.27 to 2.60)

4^th

98/2986 (3.3)

1.18 (0.82 to 1.69)

5^th

45/1704 (2.6)

Reference

Older^c

1^st

106/2711 (3.9)

1.25 (0.91 to 1.72)

2^nd

130/3228 (4.0)

1.25 (0.92 to 1.70)

3^rd

83/1845 (4.5)

1.39 (1.00 to 1.94)

4^th

95/3124 (3.0)

0.93 (0.68 to 1.28)

5^th

66/2097 (3.1)

Reference

BMI^d

≤25 kg/m²

1^st

168/4132 (4.1)

1.18 (0.89 to 1.56)

0.0907

2^nd

199/4581 (4.3)

1.31 (1.00 to 1.71)

3^rd

113/2528 (4.5)

1.40 (1.04 to 1.88)

4^th

134/4066 (3.3)

1.04 (0.78 to 1.39)

5^th

79/2643 (3.0)

Reference

>25 kg/m²

1^st

132/2418 (5.5)

1.98 (1.32 to 2.95)

2^nd

123/2525 (4.9)

1.72 (1.15 to 2.57)

3^rd

75/1357 (5.5)

1.98 (1.30 to 3.03)

4^th

59/2044 (2.9)

1.03 (0.66 to 1.60)

5^th

32/1158 (2.8)

Reference