condition mean min max ZT0-3 225.95866666666666 190.7265 279.2475 ZT4-7 205.532 205.532 205.532 ZT8-11 171.744 171.744 171.744 ZT12-15 275.7075 256.3505 295.0645 ZT16-19 197.8435 197.8435 197.8435 ZT20-23 177.075 177.075 177.075