Table 1.
Baseline characteristics of the included and excluded study population
| Included | Excluded (no BMI available at age 48±6 months) |
|||||||||
| Total | Normal weight |
Overweight | Obese | Underweight | Total | Normal weight | Overweight | Obese | Underweight | |
| Participants | ||||||||||
| N (%) | 466 997 | 430 681 (92.2) |
26 526 (5.7) |
9 250 (2.0) |
540 (0.1) |
336 924 | 278 030 (82.5) |
37 052 (11.0) |
19 546 (5.8) |
2 296 (0.7) |
| BMIz* | ||||||||||
| Mean (SD) | 0.46 (1.09) |
0.80 (0.88) |
2.40 (0.28) |
3.66 (0.51) |
−3.51 (0.47) |
0.43 (1.17) |
0.11 (0.87) |
1.72 (0.50) |
2.91 (0.73) |
−2.71 (0.64) |
| Age in months | ||||||||||
| Mean (SD) | 49.13 (2.00) |
49.13 (1.99) |
49.13 (2.01) |
49.15 (2.11) |
49.06 (2.50) |
54.30 (36.61) |
49,00 (34.58) |
76,69 (36,85) |
83.53 (31.80) |
85.72 (39,24) |
| Age in months | ||||||||||
| Female N (%) | 226 868 (48.58) |
210 274 (48.8) |
12 455 (47.0) |
3891 (42.1) |
248 (45.9) |
162 842 (48.3) |
136 061 (48.9) |
17 981 (39.8) |
7771 (48.5) |
1029 (44.8) |
| Socioeconomic status | ||||||||||
| Rural N (%) | 94 825 (20.3) |
88 571 (93.4) |
4 666 (4.9) |
1 488 (1.6) |
100 (0.1) |
59 418 (17.6) |
49 898 (84.0) |
6110 (10.3) |
3006 (5.1) |
404 (0.7) |
| Urban quintile 1 (least deprived area) | 57 439 (12.3) |
53 877 (93.8) |
2 750 (4.8) |
761 (1.3) |
51 (0.1) |
50 398 (15.0) |
42 208 (83.7) |
5557 (11.0) |
2284 (4.5) |
349 (0.7) |
| Urban quintile 2 | 68 720 (14.7) |
63 799 (92.8) |
3 715 (5.4) |
1 126 (1.6) |
80 (0.1) |
47 392 (14.1) |
38 886 (82.1) |
5471 (11.5) |
2734 (5.8) |
301 (0.6) |
| Urban quintile 3 | 71 416 (15.3) |
65 660 (91.9) |
4 170 (5.8) |
1 507 (2.1) |
79 (0.1) |
47 313 (14.0) |
38 274 (80.9) |
5564 (11.8) |
3145 (6.6) |
330 (0.7) |
| Urban quintile 4 | 72 801 (15.6) |
66 407 (91.2) |
4 569 (6.3) |
1 746 (2.4) |
79 (0.1) |
49 127 (14.6) |
39 808 (81.0) |
5755 (11.7) |
3239 (6.6) |
325 (0.7) |
| Urban quintile 5 (most deprived area) |
77 129 (16.5) |
69 581 (90.2) |
5 259 (6.8) |
2 172 (2.8) |
117 (0.2) |
55 468 (16.5) |
44 928 (81.0) |
6134 (11.1) |
3962 (7.1) |
444 (0.8) |
| Missing address | 24 667 (5.3) |
22 786 (92.4) |
1 397 (5.7) |
450 (1.8) |
34 (0.1) |
27 808 (8.3) |
24 028 (86.4) |
2461 (8.8) |
1176 (4.2) |
143 (0.5) |
| Nationality | ||||||||||
| Spanish N (%) | 415 829 (89.04) |
383 739 (89.10) |
23 568 (88.80) |
8083 (87.40) |
439 (81.30) |
272 974 (81.0) |
225 915 (81.3) |
29 833 (80.5) |
15 669 (80.2) |
1557 (67.8) |
| Other N (%) | 51 168 (10.96) |
46 942 (10.90) |
2958 (11.20) |
1167 (12.6) |
101 (18.70) |
63 950 (19.0) |
52 115 (18.7) |
7219 (19.5) |
3877 (19.8) |
739 (32.2) |
*BMIz measured age 48±6 months for included participants and measurement closest to age 4 (but <3.5 and >4.5) years available for those included.
BMIz, body mass index for age z-score.