Table 3 Quantile regression parameter estimates and 95% confidence intervals of dietary latent factors for the 5^th, 10^th, 25^th, 50^th, 75^th, 90^th, and 95^th quantiles of birthweight, adjusted for demographic and socio-economic characteristics

(95% CI)

(95% CI)

(95% CI)

(95% CI)

(95% CI)

(95% CI)

(95% CI)

(95% CI)

Intercept

2741.8^** (2570.2, 2913.4)

3060.9^** (2612.9, 3508.8)

3067.5 (2785.1, 3349.9)

3190.4** (3019.4, 3361.4)

3514.7** (3313.5, 3715.8)

4095.5** (3871.7, 4319.3)

4756.6** (4592.7, 4920.5)

3395.1**(3173.6, 3616.7)

Snack and energy protein foods factor

4.6 (38.8, 47.9)

96.3 (−16.8, 209.5)

22.6 (−48.8, 93.9)

−0.4 (−43.6, 42.7)

2.5 (−48.3, 53.3)

52.6 (−3.9, 109.1)

65.8** (24.4, 107.2)

17 (−38.7, 73.2)

Fast foods and spreads factor

2.2 (−37.0, 41.4)

−50.9 (− 153.4, 51.4)

−2.0 (−66.5, 62.6)

− 15.2 (− 54.3, 23.9)

36.6 (−9.4, 82.6)

−11.4 (−62.5, 37.8)

−26.9 (−64.4, 10.5)

−11.5 (−62.1, 39.2)

Junk foods factor

27.6 (−18.6, 73.8)

21.8 (− 99.2, 141.8)

32.6 (− 43.4, 108.6)

34.0 (− 12.0, 80.1)

25.4 (− 28.7, 79.5)

−5.8 (− 66.0, 54.4)

81.5** (37.4, 125.6)

41.8 (− 17.8, 101.4)

Protein rich foods factor

− 62.2** (− 102.8, − 21.5)

−76.7 (− 182.9, 29.4)

−71.0 (− 137.9, − 4.1)

−16.3 (− 56.8, 24.2)

14.0 (− 33.6, 61.7)

3.4 (− 49.6, 56.5)

− 64.9** (−103.8, − 26.1)

−20.3 (−72.8, 32.2)

Starch foods factor

42.5* (5.4, 79.5)

15.5 (−81.2112.2)

−29.5 (− 90.5, 31.5)

10.2 (− 26.7, 47.2)

25.3 (− 18.1, 68.7)

39.9 (− 8.4, 88.3)

−8.2 (− 43.6, 27.2)

10.7 (− 37.2, 58.5)

Nuts and rice foods factor

46.7* (6.6, 86.8)

94.2 (− 10.5, 194.9)

37.0 (− 29.0, 103.0)

47.2* (7.2, 87.1)

41.1 (−5.8, 88.1)

14.6 (− 37.7, 66.9)

76.4** (38.4, 114.9)

42.1 (−9.7, 93.8)

Vegetable rich foods factor

119.5** (74.4, 164.6)

77.2 (− 40.5, 194.9)

38.0 (− 36.3, 112.2)

14.4 (− 30.5, 59.4)

5.7 (− 47.2, 58.5)

1.9 (− 56.9, 60.8)

−75.7** (− 118.8, − 32.7)

5.6 (− 52.6, 63.8)

Alcoholic drinks factor

−46.6 (− 194.8, 101.6)

−140.9 (− 527.9, 245.9)

− 288.2 (− 532.2, − 44.3)

−84.8 (− 232.6, 62.9)

− 149.9 (− 323.6, 23.8)

− 426.6 (− 619.9, − 233.3)

− 558.1* (− 699.6, − 416.6)

− 195.9* (− 387.3, −4.6)

 Married

−82.7 (189.1, 23.8)

286.4 (−143.4, 716.2)

37.5 (−137.7, 212.7)

−207.6** (101.5, 313.7)

194.5** (69.7, 319.3)

174.0* (35.2, 32.8)

36.3 (−65.4, 137.9)

115.7 (− 21.8, 253.0)

 Living together

283.0** (118.4, 447.7)

84..5 (− 193.3, 362.4)

54.3 (− 216.7, 325.3)

− 71.8(− 235.9, 92.3)

−16.4 (− 209.4, 176.6)

−185.2 (− 399.9, 29.6)

−309.4** (− 466.7, − 152.2)

−13.3 (− 225.8, 199.3)

 Teenage

−1.4 (−95.0, 92.2)

14.2 (− 230.2, 258.5)

− 41.9 (− 195.9, 112.2)

−27.0 (− 120.3, 66.3)

−51.7 (− 161.4, 58.0)

−153.4* (− 275.5, − 31.3)

− 201.2** (− 290.6, − 111.8)

− 40.2 (− 161.0, 80.7)

 Adult age(30 years and above)

− 167.5** (− 255.4, − 79.5)

213.2 (− 442.7, 16.3)

−106.9 (− 251.6, 37.9)

−53.8 (− 141.4, 33.9)

−121.1* (− 224.1, − 17.9)

− 167.3** (− 282.0, − 52.6)

− 221.8** (− 305.8, − 137.8)

−116.7* (− 230.2, − 3.1)

 Primary or less

− 435.8* (− 673.3, − 198.2)

− 666.2* (− 1286.3, − 46.1)

− 437.1* (− 828.1, − 46.1)

−53.7 (− 290.4, 183.1)

−6.9 (− 285.4, 271.5)

−242.8 (− 552.7, 67.0)

−105.4 (− 332.2, 121.4)

− 250.9 (− 557.5, 55.8)

 High school

− 90.6 (− 185.9, 4.7)

−281.2* (− 529.8, − 32.6)

−112.5 (− 269.3, 44.2)

−51.1 (− 146.0, 43.8)

−58.8 (170.4, 52.9)

−160.2* (− 284.4, − 35.9)

− 215.5** (− 306.5, − 124.6)

−135.9* (− 258.9, − 12.9)

 Employed

−188.4 (− 387.9, 11.3)

− 569.5* (− 1090.5, − 48.4)

−95.7 (− 424.2, 232.9)

−78.0 (− 120.9, 276.9)

86.3 (− 147.7, 320.3)

−21.3 (− 281.6, 239.1)

− 174.1 (− 364.8, 16.5)

−57.2 (− 314.9, 200.5)

 No personal income

− 108.3 (− 219.2, 2.6)

− 80.2 (− 369.6, 209.2)

76.4 (− 106.1, 258.9)

31.9 (−78.6, 142.4)

82.6 (− 47.4, 212.6)

88.4 (− 56.2, 233.0)

21.2 (− 84.7, 127.1)

39.0 (− 104.1, 182.1)

 Less than R30000

− 153.7* (− 271.3, − 36.1)

− 157.1 (− 464.1, 149.8)

− 62.9 (− 256.5, 130.6)

−23.4 (− 140.6, 93.8)

28.9 (− 108.9, 166.7)

40.1 (− 113..3, 193.5)

− 192.4** (− 304.7, − 80.1)

−61.5 (− 213.3, 90.3)

 Female

81.2* (18.2, 144.3)

68.1 (− 96.3, 232.6)

58.2 (− 45.5, 161.9)

− 34.4 (− 97.2, 28.4)

− 106.7** (− 180.6, − 32.9)

− 187.6** (− 269.8, − 105.5)

−219.4** (− 279.5, − 159.2)

−67.8 (− 149.2, 13.5)

 Nulliparous

− 246.4** (− 348.5, − 144.3)

−300.1* (− 566.6, − 33.6)

−182.9 (− 350.9, − 14.9)

− 91.1 (− 192.8, 10.7)

−119.6 (− 239.2, 0.1)

− 229.3** (− 362.5, − 96.2)

− 327.3** (− 424.7, − 229.8)

−160.1* (− 291.9, − 28.4)

 Primaparous

− 179.1** (− 274.6, − 83.6)

−228.8 (− 478.1, 20.6)

−130.4 (− 80.1, − 287.6)

25.6 (− 69.6120.8)

58.8 (− 53.1, 170.8)

−47.1 (− 171.6, 77.5)

− 107.4* (− 198.6, − 16.2)

−10.5 (− 133.8, 112.8)

Family Size

−73.6** (− 93.4, − 51.9)

−19.8 (− 74.1, 34.4)

−5.5 (− 39.7, 28.6)

15.8 (−4.9, 36.5)

−3.9 (− 28.2, 20.5)

−9.4 (− 36.5, 17.7)

−51.3** (− 71.1, − 31.5)

−12.6 (− 39.4, 14.2)

Married* employed

314.0** (80.5, 547.5)

97.5 (− 512.0, 706.9)

12.0 (− 372.3, 396.3)

−223.3 (− 456.0, 9.4)

− 190.2 (− 463.8, 83.5)

− 277.5 (− 581.9, 27.1)

− 429.0** (− 651.9, − 206.1)

−65.9 (− 367.4, 235.4)

Living together* Employed

− 172.8 (− 474.1, 128.5)

−318.6 (− 1104.9, 467.8)

−110.6 (− 606.4, 385.2)

288.2 (−12.0, 588.0)

295.6 (− 57.4, 648.7)

218.2 (− 174.7, 611.1)

361.6* (73.9, 649.2)

127.2 (− 261.7, 516.0)

 Primary or less* Employed

1392.0** (742.8, 2041.2)

1666.0 (28.6, 3360.7)

753.8 (− 314.7, 1822.4)

382.8 (− 264.3, 1029.8)

664.3 (− 96.7, 1425.2)

364.9 (− 481.9, 1211.6)

98.1 (− 521.8, 718.1)

779.1 (− 58.9, 1617.2)

 High school * Employed

237.6* (30.8, 444.5)

634.8* (94.9, 1174.7)

50.5 (−289.9, 391.0)

−137.5 (−343.6, 68.6)

−69.3 (− 311.7, 173.1)

98.9 (− 170.9, 368.6)

296.4** (98.9, 493.8)

76.3 (− 190.6, 343.3)