Table 2.
Descriptive statistics by trajectory groups produced from the three-group analysis
| Trajectory Group |
|||
|---|---|---|---|
| Characteristic | Faster | Moderate | Slower |
|
| |||
| Observed n (%) | 63 (20.7) | 151 (49.7) | 90 (29.6) |
| Predicted n (%) | 71 (23.3) | 130 (42.6) | 103 (34.1) |
| Average Posterior Probability | 95.7 | 79.7 | 92.2 |
|
| |||
| Baseline Demographics | |||
|
| |||
| Age at enrollment, mean (SD) | 8.13 (0.34) | 8.25 (0.43) | 8.29 (0.46) |
| WHO age-adjusted BMI z-score, mean (SD) | −0.15 (1.18) | −0.20 (1.21) | −0.76 (1.25) |
| Total calories consumed per day (kcal), median [IQR] | 2632 [2000, 3047] | 2488 [2040, 3239] | 2551 [2036, 3306] |
| Birthweight (kg), mean (SD) | 3.38 (0.45) | 3.29 (0.51) | 3.14 (0.55) |
| Duration of breast feeding (weeks), median [IQR] | 13 [4, 26] | 13 [4, 30] | 13 [4, 26] |
| Monthly family income ≤ 250 USD, n (%) | 30 (47.6) | 98 (64.9) | 56 (62.2) |
| Highest parental education, n (%) | |||
| High school or less | 4 (6.3) | 13 (8.7) | 10 (11.4) |
| Some college or junior college | 36 (57.1) | 97 (64.7) | 51 (58.0) |
| College graduate | 23 (36.5) | 40 (26.7) | 27 (30.7) |
|
| |||
| Prepubertal Phthalate Concentrations | Median [IQR] | Median [IQR] | Median [IQR] |
|
| |||
| MEP, (ng/mL) | 92.61 [45.87, 170.75] | 92.67 [50.24, 181.23] | 82.37 [54.94, 164.29] |
| MnBP, (ng/mL) | 211.50 [126.71, 278.60] | 185.88 [120.29, 322.99] | 198.47 [138.81, 291.37] |
| MiBP, (ng/mL) | 53.16 [30.79, 88.89] | 61.39 [34.74, 87.00] | 55.48 [38.77, 86.08] |
| MBzP, (ng/mL) | 5.81 [2.48, 13.73] | 5.64 [2.74, 15.13] | 7.51 [4.11, 16.83] |
| MCPP, (ng/mL) | 10.49 [6.68, 16.74] | 10.51 [6.02, 19.45] | 11.26 [7.93, 19.64] |
| ΣDEHP, (μmol/L) | 1.02 [0.58, 1.63] | 1.02 [0.66, 1.99] | 1.14 [0.83, 1.64] |
| ΣDiNP, (μmol/L) | 0.06 [0.03, 0.09] | 0.05 [0.03, 0.10] | 0.06 [0.04, 0.12] |
| ΣDiDP, (μmol/L) | 0.02 [0.01, 0.03] | 0.02 [0.01, 0.03] | 0.02 [0.01, 0.03] |
| ΣAA, (μmol/L) | 2.55 [1.44, 3.49] | 2.48 [1.54, 3.73] | 2.46 [1.86, 3.47] |
Means and standard deviations are shown for normally distributed variables. Medians and IQRs are shown for non-normally distributed variables. SD: Standard Deviation; WHO: World Health Organization; BMI: Body Mass Index; IQR: Interquartile Range; kg: kilograms; USD: United States Dollar; ng/mL: Nanograms per milliliter; μmol/L: micromole per liter; MEP: Monoethyl; MnBP: Mono-n-butyl; MiBP: Mono-isobutyl; MBzP: Monobenzyl; MCPP: Mono-(3-carboxypropyl); DEHP: Di(2-ethylhexyl) Metabolites; DiNP: Di-iso-nonylphthalate Metabolites; DiDP: Diisodecyl Metabolites; AA: Anti-androgenic phthalates