|  | Mean | ||
---|---|---|---|---|
Variable | Definition | 1976 | Whole material | 2005 |
caesar | = the proportion of Caesarean sections | 0.047 | 0.108 | 0.146 |
 |  | (0.028) | (0.044) | (0.049) |
rev_hosp | = hospital revenue per bed in NOK 1000, deflated to 1970 prices | 101.32 | 205.42 | 364.43 |
 |  | (20.25) | (91.41) | (66.99) |
age_le201 | = the proportion of mothers less than 20 years | 0.116 | 0.057 | 0.026 |
 |  | (0.033) | (0.033) | (0.013) |
age_hi351 | = the proportion of mothers older than 35 years | 0.044 | 0.072 | 0.117 |
 |  | (0.015) | (0.031) | (0.030) |
edu_univ2 | = the proportion of mothers with university/college education | 0.126 | 0.305 | 0.450 |
 |  | (0.037) | (0.101) | (0.107) |
edu_uss2 | = the proportion of mothers with upper secondary school education | 0.557 | 0.453 | 0.362 |
 |  | (0.056) | (0.073) | (0.076) |
weight_le25003 | = the proportion of babies with a birthweight less than 2500 g | 0.045 | 0.034 | 0.031 |
 |  | (0.016) | (0.020) | (0.021) |
weight_hi45003 | = the proportion of babies with a birthweight greater than 4500 g | 0.031 | 0.039 | 0.042 |
 |  | (0.011) | (0.013) | (0.013) |
ab_present | = the proportion of babies with abnormal presentation (including breech | 0.043 | 0.059 | 0.088 |
 | presentation, transverse presentation, abnormal cephalic presentation and other) | (0.016) | (0.024) | (0.030) |
preeclam | = the proportion of mothers with preeclampsia (including unspecified, mild and severe) | 0.021 | 0.029 | 0.031 |
 |  | (0.111) | (0.015) | (0.016) |
mult_birth | = the proportion of mothers with multiple births | 0.025 | 0.024 | 0.025 |
 |  | (0.010) | (0.024) | (0.019) |
no_births | = the number of births in total | 838 | 1028 | 1176 |
 |  | (723) | (1034) | (1388) |
weekend | = the proportion of births on a Saturday or a Sunday | 0.248 | 0.248 | 0.274 |
 |  | (0.025) | (0.031) | (0.111) |
year_2002 | = 1 if year equals 2002 to 2005, 0 otherwise | Â | Â | Â |