condition mean min max ZT0-3 481.851326 481.851326 481.851326 ZT4-7 361.079543 361.079543 361.079543 ZT8-11 299.20151799999996 299.20151799999996 299.20151799999996 ZT12-15 329.8051985 329.8051985 329.8051985 ZT16-19 469.24808 469.24808 469.24808 ZT20-23 517.6664355 517.6664355 517.6664355