During the enrolment visit, length and weight were measured, as described below.
Two hundred and ninety-eight NHL cases and 889 control subjects were matched by SHCS centre, gender, age group, CD4+ count at enrolment, and length of follow-up.
18 We considered study characteristics such as population, time to enrolment, and length of follow-up in the analysis and grouped studies were according to these characteristics.
We then identified 2 control infants for each of the remaining infants based on gender, gestational age (± 2 weeks), birth weight (± 300 grams), age at enrolment, and length of stay following enrolment of ≥21 days.
Control infants for infant-related outcomes were identified from the previous year's NICU clinical database (January to December, 2010) and matched for gender, gestational age (± 2 weeks), birth weight (± 300 grams), age at enrolment, and length of stay following enrolment of ≥21 days.
a Lifestyle factors at enrolment: smoking, BMI, length of school attendance, municipality SES, alcohol intake and physical activity.
A dating ultrasound scan (Logiqbook XP, General Electric Medical Systems, UK) was performed within a week of enrolment using crown-rump length or head circumference (femur length if unavailable) to estimate GA [ 9].
Respondents with longer length of enrolment in the insurance 76 (54.0%) were more satisfied, while those with shorter length of enrolment in the insurance 98 (70.0%) were less satisfied.
Further matching variables included location [ 12, 13, 24] and length of enrolment [ 16].
Length of employment, salary income, hospital visits and length of enrolment in the health insurance slightly influenced satisfaction.
