Table 1. Burden of late VKDB in the population.

Study	Country	Period of study	Method of data collection	Incidence per 100 000 live births (95% CI)
Khanjanasthiti et al.22	Thailand	1977–1978	Not known	80
Nagao and Nakayama23 a	Japan	1978–1989	Nationwide hospital study	25
Hanawa et al.11	Japan	1981–1983	Large pediatric hospital survey	10.5 (7.0–15.0)
Ungchusak et al.24	Thailand	1983	Nationwide hospital survey	35
von Kries13 b	Germany	1988–1989	Pediatric hospital survey	7.2 (3.5–13.3)
McNinch and Tripp14	British Isles	1988–1990	Pediatrician-based surveillance	4.4 (2.0–8.4)
Chuansumrit et al.15	Thailand	1981–1984	Nationwide hospital survey	72.0
Newton-Sánchez et al.25 a	Mexico	1997–2000	Retrospective study in a level 3 hospital, data of which are extrapolated to population (average annual live births in the state)	80
Zhou et al.26 a	China	2002c	Survey of five districts and six counties in Shandong Province (using stratified cluster sampling)	327 (overall including classical VKDB)

Abbreviations: CI, confidence interval; VKDB, vitamin K deficiency bleeding.

^aStatus of vitamin K prophylaxis not mentioned clearly in the original study.

^bThe published study reported all forms of VKDB–data provided here on late VKDB are from the review by von Kries.¹³

^cFull text could not be retrieved; refers to the year of publication.