condition mean min max ZT0-3 10.05 10.05 10.05 ZT4-7 6.4 6.4 6.4 ZT8-11 23.549999999999997 23.549999999999997 23.549999999999997 ZT12-15 12.600000000000001 12.600000000000001 12.600000000000001 ZT16-19 38.900000000000006 38.900000000000006 38.900000000000006 ZT20-23 20.85 20.85 20.85