condition mean min max ZT0-3 5.838875 5.838875 5.838875 ZT4-7 2.689395 2.689395 2.689395 ZT8-11 2.919025 2.919025 2.919025 ZT12-15 8.98513 8.98513 8.98513 ZT16-19 10.542024999999999 10.542024999999999 10.542024999999999 ZT20-23 5.091495 5.091495 5.091495