condition mean min max ZT0-3 20.29485 18.7187 21.871000000000002 ZT4-7 8.80049 8.80049 8.80049 ZT8-11 10.28825 10.28825 10.28825 ZT12-15 0 0 0 ZT16-19 14.394 14.394 14.394 ZT20-23 14.5063 14.5063 14.5063