condition mean min max ZT0-3 9.12088 9.12088 9.12088 ZT4-7 13.383849999999999 13.383849999999999 13.383849999999999 ZT8-11 8.703935000000001 8.703935000000001 8.703935000000001 ZT12-15 4.833495 4.833495 4.833495 ZT16-19 5.2217 5.2217 5.2217 ZT20-23 5.417606666666667 5.417606666666667 5.417606666666667