condition mean min max ZT0-3 59.513374999999996 56.0771 62.94965 ZT4-7 39.405249999999995 39.405249999999995 39.405249999999995 ZT8-11 22.9817 22.9817 22.9817 ZT12-15 0 0 0 ZT16-19 53.06465 53.06465 53.06465 ZT20-23 53.61265 53.61265 53.61265