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Table 2 Comparison of children by website registration status

From: Engaging parents using web-based feedback on child growth to reduce childhood obesity: a mixed methods study

Variable Description Ever registered Never registered p-value
Participants All children 13,536 49,801  
Male % (n) 50.36 (6817) 50.68 (25218) 0.576
Age at start (mean) years (SD) 7.30 (2.55) 7.64 (2.54) <0.001
Age at start (median) years (IQR) 7.25 (4.83–9.99) 7.83 (4.99–10.24) <0.001
Deprivation % (n)    <0.001
(IMD rank quintile) Q1 (most deprived) 66.94 (9061) 77.84 (38765)  
Q2 16.04 (2171) 12.04 (5997)  
Q3 9.53 (1290) 5.18 (2580)  
Q4 4.93 (668) 2.09 (1039)  
Q5 1.54 (209) 0.62 (311)  
Not known 1.01 (137) 2.23 (1109)  
Ethnicity % (n)    <0.001
White 50.43 (6826) 32.69 (16281)  
Mixed black/white 3.66 (496) 3.42 (1703)  
Black/British black 7.29 (987) 12.84 (6396)  
Asian/British Asian 15.92 (2155) 19.51 (9718)  
Other 5.07 (687) 5.70 (2838)  
Not stated/unknown 16.98 (2298) 24.11 (12005)  
First recorded BMI categorical, % (n)    <0.001
Underweight 1.30 (176) 1.47 (734)  
Normal weight 74.99 (10151) 73.65 (36680)  
Overweight 12.50 (1692) 12.40 (6173)  
Obese 7.28 (985) 7.82 (3892)  
Severely obese 3.93 (532) 4.66 (2322)  
Overweight or obese 23.71 (3209) 24.87 (12387)  
Median first recorded BMI2 kg/m2 (continuous, IQR) 16.59 (15.43–18.48) 16.71 (15.48–18.87) 0.966
Mean annual change in UK90 BMI centile1 centiles per annum (SD) −0.47 (±12.14) 0.51 (±12.21) <0.001
Median annual change in UK90 BMI centile1 centiles per annum (IQR) − 0.14 (−6.01–4.44) 0.07 (−4.88–5.33) <0.001
Median time span of recorded BMI values1 days (IQR) 396 (365–427) 397 (366–427) <0.001
Total number of BMI measurements recorded 2013–2017   26,982 81,113 <0.001
Mean number of BMI measurements recorded per child 2013–2017   1.99 1.63 <0.001
  1. 2Based on values from 34,803 children with multiple recorded measurements 2013/14–2016/17