condition mean min max ZT0-3 9.991704 9.991704 9.991704 ZT4-7 11.493227 11.493227 11.493227 ZT8-11 10.401466 10.401466 10.401466 ZT12-15 11.727689 11.727689 11.727689 ZT16-19 11.0210235 11.0210235 11.0210235 ZT20-23 9.612061 9.612061 9.612061