Table 3.

Procedures conducted in the Isle of Wight cohort (n)

Variable	Birth	Year 1	Year 2	Year 4	Year 10	Year 18	Year 26
Questionnaires	1536	1369	1231	1218	1373	1313	1033
Physical examination	–	323	410	977	1036	864	544
Height/weight	1501	1090	399	1053	1043	964	681
Skin prick tests	–	323	410	977	1036	851	556
Spirometry	–	–	–	–	980	839	544
Bronchial provocation tests	–	–	–	–	784	586	Ongoing
Sputum induction	–	–	–	–	25	100	–
Exhaled nitric oxide	–	–	–	–	–	822	542
Blood samples	Maternal = 1150 Cord = 1275 Guthrie card at 7 days = 1150	–	–	–	950	550	503
Urine	–	–	–	–	970	650	528
Saliva	–	–	–	–	850	500	22