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Table 1 Distribution/proportions of baseline characteristics by fourths of age at peak height velocity based on imputed data

From: Puberty timing and markers of cardiovascular structure and function at 25 years: a prospective cohort study

  Quartile 1, n (%) Quartile 2, n (%) Quartile 3, n (%) Quartile 4, n (%)
Household social class     
 Professional 182 (16.78) 188 (17.38) 218 (20.02) 213 (19.67)
 Managerial/technical 501 (46.18) 479 (44.09) 517 (47.64) 514 (47.45)
 Non-manual 248 (22.87) 273 (25.19) 230 (21.22) 235 (21.75)
 Manual/part skills/unskilled 154 (14.17) 145 (13.34) 121 (11.12) 121 (11.13)
Maternal education 182 (16.78) 188 (17.38) 218 (20.02) 213 (19.67)
 Less than O level 217 (20.03) 181 (16.72) 164 (15.16) 197 (18.18)
 O level 372 (34.24) 392 (36.02) 368 (33.83) 330 (30.51)
 A level 298 (27.49) 293 (27.04) 339 (31.20) 323 (29.80)
 Degree or above 198 (18.24) 219 (20.22) 215 (19.81) 233 (21.51)
Mother’s partner’s education     
 Less than O level 312 (28.73) 261 (24.14) 246 (22.64) 237 (21.87)
 O level 230 (21.19) 232 (21.39) 223 (20.52) 250 (23.07)
 A level 300 (27.65) 331 (30.51) 321 (29.56) 300 (27.66)
 Degree or above 243 (22.43) 260 (23.96) 296 (27.28) 297 (27.40)
Breastfeeding until 3 months     
 Exclusively 389 (35.83) 407 (37.53) 408 (37.59) 383 (35.35)
 Non-exclusively 523 (48.12) 514 (47.37) 555 (51.12) 570 (52.61)
 Never 174 (16.05) 164 (15.10) 122 (11.29) 130 (12.04)
First-born child 559 (51.51) 506 (46.67) 547 (50.42) 516 (47.64)
Maternal marital status     
 Never married 143 (13.14) 139 (12.79) 127 (11.74) 144 (13.29)
 Married 883 (81.42) 896 (82.60) 913 (84.01) 891 (82.28)
 Widowed/divorced/separated 59 (5.44) 50 (4.61) 46 (4.25) 48 (4.43)
Maternal smoking status     
 No 892 (82.20) 930 (85.68) 931 (85.82) 924 (85.28)
 Yes 193 (17.80) 155 (14.32) 154 (14.18) 159 (14.72)
  Mean (SE) Mean (SE) Mean (SE) Mean (SE)
Maternal age at delivery (years) 29.25 (0.14) 29.35 (0.14) 29.64 (0.13) 29.74 (0.14)
Gestational age (weeks) 39.54 (0.05) 39.48 (0.05) 39.32 (0.05) 39.37 (0.05)
Birthweight (kg) 3.35 (0.01) 3.41 (0.01) 3.44 (0.01) 3.50 (0.01)
Maternal BMI (kg/m2) 23.13 (0.11) 22.80 (0.11) 22.63 (0.11) 22.70 (0.11)
Height at age 9 (cm) 141.36 (0.19) 138.95 (0.19) 139.12 (0.18) 138.29 (0.18)
Fat mass at age 9 (kg) 37.52 (0.25) 33.69 (0.21) 33.22 (0.20) 31.87 (0.18)
  1. Abbreviations: SE standard error, BMI body mass index