condition mean min max ZT0-3 39.36195 39.36195 39.36195 ZT4-7 19.21685 19.21685 19.21685 ZT8-11 36.37565 36.37565 36.37565 ZT12-15 41.32615 41.32615 41.32615 ZT16-19 61.701049999999995 61.701049999999995 61.701049999999995 ZT20-23 50.16045 50.16045 50.16045