condition mean min max ZT0-3 0.9956659999999999 0.9956659999999999 0.9956659999999999 ZT4-7 0.519299 0.519299 0.519299 ZT8-11 0.986981 0.986981 0.986981 ZT12-15 7.533315 7.533315 7.533315 ZT16-19 12.6704 12.6704 12.6704 ZT20-23 1.75243 1.75243 1.75243