condition mean min max ZT0-3 4.7281949999999995 4.72461 4.73178 ZT4-7 4.714700000000001 4.714700000000001 4.714700000000001 ZT8-11 4.487545 4.487545 4.487545 ZT12-15 0 0 0 ZT16-19 5.265475 5.265475 5.265475 ZT20-23 4.96488 4.96488 4.96488