condition mean min max ZT0-3 163.32063165 153.7716418 172.8696215 ZT4-7 155.59171744999998 137.63125344999997 173.55218144999998 ZT8-11 200.8949844 174.32412425 227.46584454999999 ZT12-15 185.429598075 174.4116661 196.44753005 ZT16-19 200.705891775 187.25393055 214.15785300000002 ZT20-23 247.272447 245.9072466 248.6376474