condition mean min max ZT0-3 17.6261 17.6261 17.6261 ZT4-7 12.94505 12.94505 12.94505 ZT8-11 11.03555 11.03555 11.03555 ZT12-15 13.408100000000001 13.408100000000001 13.408100000000001 ZT16-19 18.4677 18.4677 18.4677 ZT20-23 20.096049999999998 20.096049999999998 20.096049999999998