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Table 2 E2 concentrations measured with the E2 reagent and iE2 reagent according to largest follicle size

From: Changes in estrone and estradiol levels during follicle development: a retrospective large-scale study

Diameter of the largest follicle

Serum E2 (pg/mL)

Age <38 year (n = 4032)

Age 38–40 year (n = 3740)

Age >40 year (n = 6599)

11 mm

E2 reagent (n = 125)

99.9 ± 32.6a

E2 reagent (n = 99)

101.5 ± 30.9a

E2 reagent (n = 195)

113.4 ± 45.3a

iE2 reagent (n = 191)

68.0 ± 34.7a

iE2 reagent (n = 147)

71.0 ± 40.4a

iE2 reagent (n = 220)

86.8 ± 51.8a

12 mm

E2 reagent (n = 114)

105.8 ± 35.6a

E2 reagent (n = 122)

113.5 ± 40.9a

E2 reagent (n = 226)

125.3 ± 48.2a

iE2 reagent (n = 234)

80.4 ± 41.8a

iE2 reagent (n = 177)

84.7 ± 42.9a

iE2 reagent (n = 297)

102.8 ± 53.5a

13 mm

E2 reagent (n = 127)

122.2 ± 44.6a

E2 reagent (n = 114)

135.9 ± 49.0a

E2 reagent (n = 242)

142.2 ± 49.1a

iE2 reagent (n = 241)

87.3 ± 42.6a

iE2 reagent (n = 200)

96.7 ± 44.6a

iE2 reagent (n = 284)

116.1 ± 61.2a

14 mm

E2 reagent (n = 125)

130.7 ± 38.8a

E2 reagent (n = 125)

155.2 ± 57.4a

E2 reagent (n = 234)

166.6 ± 59.8a

iE2 reagent (n = 246)

100.3 ± 51.7a

iE2 reagent (n = 182)

115.8 ± 58.6a

iE2 reagent (n = 313)

126.1 ± 64.0a

15 mm

E2 reagent (n = 118)

168.0 ± 57.0a

E2 reagent (n = 154)

168.8 ± 60.2a

E2 reagent (n = 313)

187.0 ± 70.6a

iE2 reagent (n = 268)

132.6 ± 64.2a

iE2 reagent (n = 238)

150.2 ± 66.5a

iE2 reagent (n = 407)

170.6 ± 76.5a

16 mm

E2 reagent (n = 134)

186.7 ± 67.8a

E2 reagent (n = 173)

195.4 ± 60.0a

E2 reagent (n = 351)

210.4 ± 64.6

iE2 reagent (n = 287)

160.0 ± 77.9a

iE2 reagent (n = 222)

177.0 ± 78.2a

iE2 reagent (n = 444)

197.4 ± 79.5

17 mm

E2 reagent (n = 151)

228.5 ± 66.2a

E2 reagent (n = 158)

236.6 ± 64.0a

E2 reagent (n = 351)

231.8 ± 61.1

iE2 reagent (n = 322)

200.2 ± 85.7a

iE2 reagent (n = 282)

216.5 ± 78.5a

iE2 reagent (n = 489)

222.3 ± 86.6

18 mm

E2 reagent (n = 151)

241.0 ± 75.0

E2 reagent (n = 143)

257.3 ± 60.9a

E2 reagent (n = 348)

255.9 ± 59.2

iE2 reagent (n = 323)

229.2 ± 85.4

iE2 reagent (n = 356)

233.5 ± 88.9a

iE2 reagent (n = 529)

247.0 ± 82.2

19 mm

E2 reagent (n = 102)

253.4 ± 66.1

E2 reagent (n = 112)

260.8 ± 68.2

E2 reagent (n = 230)

259.2 ± 64.6

iE2 reagent (n = 242)

249.6 ± 78.0

iE2 reagent (n = 273)

256.0 ± 79.5

iE2 reagent (n = 368)

261.0 ± 83.5

20 mm

E2 reagent (n = 109)

275.2 ± 72.2

E2 reagent (n = 107)

279.9 ± 75.1

E2 reagent (n = 230)

281.5 ± 74.2

iE2 reagent (n = 422)

275.6 ± 95.2

iE2 reagent (n = 356)

285.1 ± 88.0

iE2 reagent (n = 528)

280.6 ± 92.0

  1. Data are presented as mean ± standard deviation
  2. aSignificant differences in serum E2 concentration were found between measurements performed using the ST AIA-PACK E2 reagent and the ST AIA-PACK iE2 reagent (P <0.01)
  3. E2 estradiol, E2 reagent ST AIA-PACK E2 reagent, iE2 reagent ST AIA-PACK iE2 reagent