condition mean min max ZT0-3 43.966293 43.966293 43.966293 ZT4-7 58.089236 58.089236 58.089236 ZT8-11 55.563570999999996 55.563570999999996 55.563570999999996 ZT12-15 60.4484375 60.4484375 60.4484375 ZT16-19 60.422089 60.422089 60.422089 ZT20-23 51.7857645 51.7857645 51.7857645