Applying 1540s precocious marriage pattern to 1930 shows that 4/5 of difference is due to marriage
2.2 = total difference 1930-1540 (3.8-1.6)
1.8 = difference due to marriage (3.8-2.0)
0.4 = difference due to mortality (2.0-1.6)
of the 2.2 difference, 1.8 (82%) was due to precocious marriage
only 0.4 (18%) “was due to “demographic decadence.”