condition mean min max ZT0-3 9.3731575 9.022279999999999 9.724035 ZT4-7 10.6316 10.6316 10.6316 ZT8-11 11.8823 11.8823 11.8823 ZT12-15 0 0 0 ZT16-19 9.718465 9.718465 9.718465 ZT20-23 11.95555 11.95555 11.95555