condition mean min max ZT0-3 2.71909 2.48581 2.95237 ZT4-7 2.302635 2.302635 2.302635 ZT8-11 2.48942 2.48942 2.48942 ZT12-15 0 0 0 ZT16-19 3.27433 3.27433 3.27433 ZT20-23 3.52481 3.52481 3.52481