Table 3.
Quantile regression parameter estimates and 95% confidence intervals of dietary latent factors for the 5th, 10th, 25th, 50th, 75th, 90th, and 95th quantiles of birthweight, adjusted for demographic and socio-economic characteristics
| Quantiles | 5th | 10th | 25th | 50th | 75th | 90th | 95th | OLS |
|---|---|---|---|---|---|---|---|---|
| (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) |
| Marital status (REF=Single) | ||||||||
| 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) |
| Maternal age (REF=Prime of fertility) | ||||||||
| 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) |
| Maternal education (REF = College or University) | ||||||||
| 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) |
| Employment (REF=Unemployed) | ||||||||
| 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) |
| Maternal annual income (REF = R30000 and above) | ||||||||
| 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) |
| Infant Gender (REF = Male) | ||||||||
| 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) |
| Parity (REF = Multiparous) | ||||||||
| 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) |
| Single*Unemployed (REF) | ||||||||
| 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) |
| College or University*Unemployed (REF) | ||||||||
**Significant at 0.01 level*significant at 0.05 level