SCOTLAND codes This is data gathered between 1944 and 1985 1. Year 2. Stillbirth rate in social class I -- professional 3. Stillbirth rate in social class II -- intermediate 4. Stillbirth rate in social class III -- skilled 5. Stillbirth rate in social class IV: semi-skilled 6. Still birthrate in social class V -- unskilled 7. Legitimate fertility rate per 1000 women 8. Illegitimate fertility rate per 1000 women Fertility rates were formed by dividing the total number of legitimate and illegitimate births (respectively)  in the year by the size of the female population in that year