condition mean min max ZT0-3 11.371649999999999 11.371649999999999 11.371649999999999 ZT4-7 10.112955 10.112955 10.112955 ZT8-11 9.641425 9.641425 9.641425 ZT12-15 10.112380000000002 10.112380000000002 10.112380000000002 ZT16-19 11.88245 11.88245 11.88245 ZT20-23 11.87715 11.87715 11.87715