Table 1 Baseline characteristics of the study participants grouped by quartiles of the BRI.

From: Association between body roundness index and myopia among US adolescents: a cross-sectional study of NHANES 2001–2006

Variable

Total

Q1 (BRI < 2.083)

Q2 (2.083 ≤ BRI < 2.725)

Q3 (2.725 ≤ BRI < 4.005)

Q4 (BRI ≥ 4.005)

Statistic F/χ2

P

Participants numbers, n

3915

944

961

992

1018

  

Age, mean (SE)

14.37 (0.04)

14.15 (0.06)

14.29 (0.06)

14.48 (0.07)

14.56 (0.10)

6.21

0.001

PIR, mean (SE)

2.19 (0.05)

2.32 (0.07)

2.33 (0.07)

2.17 (0.06)

1.94 (0.07)

12.17

< 0.001

WC, mean (SE)

80.23 (0.32)

67.36 (0.18)

72.93 (0.18)

80.53 (0.20)

100.10 (0.52)

1340.06

< 0.001

Height, mean (SE)

163.94 (0.22)

165.95 (0.34)

163.90 (0.33)

162.40 (0.34)

163.53 (0.38)

29.99

< 0.001

VD, mean (SE)

55.28 (0.99)

57.86 (1.33)

57.59 (1.31)

55.21 (1.23)

50.48 (0.95)

16.41

< 0.001

WHtR, mean (SE)

0.49 (0.00)

0.41 (0.00)

0.44 (0.00)

0.50 (0.00)

0.61 (0.00)

3970.51

< 0.001

Sex, n (%)

203.35

< 0.001

 Male

1899 (49.14)

275 (30.34)

460 (50.00)

586 (59.74)

578 (56.45)

  

 Female

2016 (50.86)

669 (69.66)

501 (50.00)

406 (40.26)

440 (43.55)

  

Race, n (%)

173.34

< 0.001

 Mexican American

1183 (31.00)

161 (18.06)

271 (29.54)

385 (39.82)

366 (36.55)

  

 Other Hispanic

134 (3.40)

35 (3.57)

29 (2.82)

37 (3.88)

33 (3.32)

  

 Non-Hispanic White

1143 (28.94)

262 (27.77)

307 (31.23)

292 (28.80)

282 (27.97)

  

 Non-Hispanic Black

1293 (32.51)

439 (45.52)

314 (32.23)

242 (24.11)

298 (28.22)

  

 Other race

162 (4.15)

47 (5.08)

40 (4.19)

36 (3.38)

39 (3.94)

  

Ref education, n (%)

48.73

< 0.001

 Less than high school

1236 (32.15)

238 (25.64)

300 (31.73)

329 (33.94)

369 (37.30)

  

 High school

984 (24.53)

242 (24.89)

216 (22.15)

248 (24.48)

278 (26.60)

  

 More than high school

1695 (43.32)

464 (49.47)

445 (46.12)

415 (41.58)

371 (36.11)

  

ST, n (%)

8.46

0.055

 ≤2 h

1056 (27.49)

271 (29.28)

279 (29.29)

265 (27.18)

241 (24.22)

  

 > 2 h

2859 (72.51)

673 (70.72)

682 (70.71)

727 (72.82)

777 (75.78)

  

Myopia new, n (%)

21.04

< 0.001

 Not myopia

2184 (55.84)

544 (57.12)

559 (57.38)

580 (59.17)

501 (49.69)

  

 Myopia

1731 (44.16)

400 (42.88)

402 (42.62)

412 (40.83)

517 (50.31)

  

Myopia group, n(%)

23.50

0.010

 Not myopia

2184 (55.84)

544 (57.12)

559 (57.38)

580 (59.17)

501 (49.69)

  

 Low myopia

1307 (33.64)

303 (32.60)

308 (32.98)

310 (31.18)

386 (37.80)

  

 Moderate myopia

335 (8.50)

75 (8.03)

76 (7.88)

76 (7.58)

108 (10.51)

  

 High myopia

89 (2.02)

22 (2.26)

18 (1.75)

26 (2.07)

23 (2.00)

  

Mets, n (%)

18.97

0.002

 Low physical activity

705 (17.94)

141 (15.30)

152 (15.64)

185 (18.97)

227 (21.84)

  

 High physical activity

3210 (82.06)

803 (84.70)

809 (84.36)

807 (81.03)

791 (78.16)

  

PIR, n (%)

41.31

< 0.001

 ≤1.30

1536 (38.24)

339 (34.80)

342 (34.54)

395 (38.95)

460 (44.68)

  

 1.31–3.50

1465 (37.99)

347 (37.62)

367 (38.99)

372 (37.88)

379 (37.48)

  

 >3.50

914 (23.76)

258 (27.59)

252 (26.47)

225 (23.17)

179 (17.83)

  
  1. Values are presented as Mean(SE) for weighted continuous variables, and P-value was calculated by the weighted One-way ANOVA test. Values are presented as n (%) for categorical variables, and P-value was calculated by weighted chi-square test.
  2. n, sample size; SE, standard error; BRI, body roundness index; WC, waist circumference; WHtR, waist-to-height ratio; Ref Education, Education level of guardians; PIR, poverty income ratio; Mets, physical activity; ST, Screen time; VD, Serum vitamin D; Myopia New, Myopia or not; Q1, 1st quartile; Q2, 2nd quartile; Q3, 3rd quartile; Q4, 4th quartile.
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