"The largest factor in the rise in mean age at first birth
is the decline in the proportion of first births to mothers under age 20, down 42% from 2000 to 2014, or from approximately 1 in 4 births to 1 in 7," the CDC reported.
This is also confirmed by the mean age at first birth
. The MAFB value among religious women reached about 19 years and for non-religious women it was almost 22.5 year.
Table-IV: Association Analyses: Groups of age at first birth
with groups of number of children in triple negative and triple positive breast cancer.
The socio-demographic data of the study group Age (*) 35.49[+ or -]3.4 Marital status (married/single) 144/2 Number of children (**) 1 (1) Age at first birth
(*) 30.4[+ or -]3.1 Educational status in pediatrics (**) (years) 10 (*) Mean [+ or -] standard deviation, (**) Median (interquartile range] Table II.
Among women who had had a child, the mean age at first birth
was 17 and the mean marriage-to-birth interval was 12.4 months.
The covariates included demographic variables (mother's age at first birth
and birth order of child), socio-economic variables (mother's education level and wealth quintile), institutional variables (place of delivery, antenatal care [ANC] visits) and spatial (region and provinces) categories following literature review.10-12 The demographic variables included mother's age at birth and the birth order of the child.
Also, we are interested in analyzing the role played by the age at first birth
and the gender of previous children in the timing of future births.
Mother's age at first birth
was strongly associated with the probability of child hospitalization, while living in a single-parent family, not having been breastfed, and being large for gestational age all showed smaller yet statistically significant relationships with this probability.
The reproductive and hormonal risk factors known to affect breast cancer include fertility (number of children) and breastfeeding, which are protective; age at first birth
, in which a lower age is protective and a higher age conducive; and induced abortion, which is conducive to breast cancer as is childlessness.
Information regarding baseline conditions was collected from the medical record data in our hospital and included age (years), TNM stages (I, II, III, and IV), tumor size ([less than or equal to] 1 cm, >1 cm), multicentricity (solitary, multiple), bilaterality (unilateral, bilateral), intrathyroidal dissemination (present, absent), thyroid nodular goiter (present, absent), Hashimoto's thyroiditis (present, absent), operation on primary tumor (total thyroidectomy, subtotal thyroidectomy), and lymph node dissection (not done, central node dissection, and total node dissection), iodine radiotherapy (done, not done), and time of pregnancy (age at first birth
, age at last birth).
Literature also indicates conflicting information on whether age at first birth
, parity, and duration of breastfeeding are potential risk factors for PDM [4,12].
Among identified determinants, maternal education, maternal age at first birth
and mothers' marital status, preceding birth interval, birth order, breastfeeding, infections, healthcare, family income, and hygiene practice were found to be important determinants of childhood mortality.