condition mean min max ZT0-3 3.4214849999999997 3.4214849999999997 3.4214849999999997 ZT4-7 3.4126649999999996 3.4126649999999996 3.4126649999999996 ZT8-11 5.95439 5.95439 5.95439 ZT12-15 7.917909999999999 7.917909999999999 7.917909999999999 ZT16-19 4.704535 4.704535 4.704535 ZT20-23 3.81557 3.81557 3.81557