condition mean min max ZT0-3 1.9088474999999998 1.885695 1.932 ZT4-7 0.951575 0.951575 0.951575 ZT8-11 1.937305 1.937305 1.937305 ZT12-15 0 0 0 ZT16-19 1.90327 1.90327 1.90327 ZT20-23 4.79276 4.79276 4.79276