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Table 1.

Overview of the H II regions sample.

Tot. # of H II regions 4679 (a)
Regions hosting YSCs with t ≤ 10 Myr 531
Regions hosting WRs (of which without YSC) 63 (10)
Tot. # regions hosting YSC and/or WR 541 (b)

Notes. We outline the number of regions which contain at least a YSC or a WR star. This sub-sample is used in the analyses presented in Sects. 6.4 and 7.

(a)

Of which 4654 have valid ne measurements and 149 overlap with SNRs.

(b)

Of which 499 have valid ne measurements and 42 overlap with evolved SNRs.

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