condition mean min max ZT0-3 9.845938 9.845938 9.845938 ZT4-7 10.6843955 10.6843955 10.6843955 ZT8-11 9.653233 9.653233 9.653233 ZT12-15 12.4788435 12.4788435 12.4788435 ZT16-19 8.9512325 8.9512325 8.9512325 ZT20-23 13.0807215 13.0807215 13.0807215