condition mean min max ZT0-3 2.12572 1.95458 2.2968599999999997 ZT4-7 1.985315 1.985315 1.985315 ZT8-11 3.3536 3.3536 3.3536 ZT12-15 0 0 0 ZT16-19 2.565195 2.565195 2.565195 ZT20-23 2.57911 2.57911 2.57911