condition mean min max ZT0-3 7.24563 7.24563 7.24563 ZT4-7 5.168245000000001 5.168245000000001 5.168245000000001 ZT8-11 5.861800000000001 5.861800000000001 5.861800000000001 ZT12-15 6.572565 6.572565 6.572565 ZT16-19 7.415645 7.415645 7.415645 ZT20-23 7.32386 7.32386 7.32386