condition mean min max ZT0-3 9.244605 9.244605 9.244605 ZT4-7 7.6648 7.6648 7.6648 ZT8-11 9.841294999999999 9.841294999999999 9.841294999999999 ZT12-15 11.91255 11.91255 11.91255 ZT16-19 15.14 15.14 15.14 ZT20-23 12.134250000000002 12.134250000000002 12.134250000000002